With the first official depth charts out, current positions on the depth chart:
Travis Carrie - 2d team CB, behind Terrance Mitchell
https://www.clevelandbrowns.com/team/depth-chart

Blair Brown - 2d team WLB, behind Telvin Smith, Sr
https://www.jaguars.com/team/depth-chart

Tarrell Basham - 2d team DE, behind Kemoko Turay
https://www.colts.com/team/depth-chart

Quinton Poling - 3rd team LB, behind Raekwon McMillan and Chase Allen
https://www.miamidolphins.com/team/depth-chart

Casey Sayles - 3rd team DT, behind Cameron Heyward and L.T. Walton
https://www.steelers.com/team/depth-chart /

Did I miss anyone?

Is Mike Mitchell retired?

Mitchell is still one of many unsigned veteran safeties. Have not seen any announcement of a retirement.

How many are on rosters now doesn't matter. The question is, how many will be on rosters when they hit the 53-man roster. Last year there were 4, Mitchell, Carrie, Basham, and Brown, and that included 2 starters. Both may be all-time records.

This year there are 6 for now, but only Carrie, Basham, and Brown appear safe. Poling is on the bubble, as a 3rd team linebacker. Here are two early projections for the final 53 men:
https://finheaven.com/threads/projected-53-man-dolphins-d... /
https://www.thephinsider.com/2018/5/27/17386218/miami-dol...

The first one projects that the Dolphins will keep 7 linebackers, including Poling. The second one projects that they will keep only 6 linebackers, with Poling being one of them, however, he will have to move up to 2d team for that to happen.

Similarly, Sayles is on the bubble. Here are three projected final 53-man rosters for the Steelers:
https://stillcurtain.com/2018/07/03/pittsburgh-steelers-b... /
https://www.behindthesteelcurtain.com/2018/6/15/17468512/...
https://steelerswire.usatoday.com/2018/05/08/updated-stee... /

All project that the Steelers will keep 6 defensive linemen for their 3 DL spots. In all cases, they project the starters from last year, Heyward, Hargrave, and Tuitt, plus Walton and Alualu. Who will the last guy be? Las year's backup, McCullers? This year's draftee, Frazier? All three project Frazier will be the one kept, but for now, McCullers is ahead on the depth chart.

Sayles has to beat out Walton for a spot on the final 53. Walton is another MAC player, from CMU. In 3 seasons Walton has 20 tackles and 2 sacks. If Sayles can't beat out Walton, he could make the practice squad, which would give him an opportunity for more playing chances. That was what Cohen did, as I recall, and when someone ahead got hurt, he stepped up and took advantage of the opportunity.

As a sixth string TE, it seems unlikely that Mangen would make it to the 53 man roster. He's going to need to move up, and quickly. I would expect only 3 tight ends on the final team, with possibly another on the practice squad.


In the end, it seems possible Ohio may have 4 players on rosters this year, and if so, will tie last year.

You can find a list of Bobcats who have had a professional career in the media guide, at page 102. Unfortunately it is not complete, and there are players missing, such as Jordan Thompson, Phil Bates, Noah Keller and players in the last few years. The 2018 guide is not up yet, so here's a link to the 2017 guide:
https://d2o2figo6ddd0g.cloudfront.net/z/k/br8ap5cj0lqit6/...

Here are ones that have played in recent years (and note that it includes everyone that signed a contract, even if they never made the final 53 man roster):
Josh Abrams 2008-9 Green Bay Packers
Tarrell Basham 2017-8 Indianapolis Colts
Phil Bates 2012-14 Seattle Seahawks, 2014 Cleveland Browns, 2015 Dallas Cowboys
Beau Blankenship 2014 Jacksonville Jaguars
Lavon Brazill 2012-14 Indianapolis Colts
Blair Brown 2017-8 Jacksonville Jaguars
Dion Byrum 2006-7 Carolina Panthers
Chad Brinker 2003 New York Jets
Kevin Carberry 2005 Cleveland Browns, 2005-6 Detroit Lions
Travis Carrie 2014-17 Oakland Raiders, 2018 Cleveland Browns
Chip Cox 2005 Detroit Lions
Donte' Foster 2014-5 Minnesota Vikings, 2015 San Diego Chargers, 2015 Dallas Cowboys, 2016 New York Giants, 2016 Tennessee Titans
Landon Cohen 2008-9 Detroit Lions, 2010 Jacksonville Jaguars, 2010-11 New England Patriots, 2012 Arizona Cardinals, 2012 Philadelphia Eagles, 2013 Dallas Cowboys, 2013 Chicago Bears, 2014 Buffalo Bills, 2014-5 Seattle Seahawks
Stafford Gatling 2011 New York Jets
Steven Goulet 2011 Oakland Raiders
Eric Herman 2013-5 New York Giants, 2015 Baltimore Ravens, 2016 Indianapolis Colts
Noah Keller 2012 St. Louis Rams
Todd Koenig 2008 Cleveland Browns
Troy Mangen 2018 Atlanta Falcons
Scott Mayle 2007-8 Buffalo Bills, 2008 Kansas City Chiefs
Terrance McCrae 2011 Pittsburgh Steelers
Kalvin McRae 2008 Kansas City Chiefs
Michael Mitchell 2009-12 Oakland Raiders, 2013 Carolina Panthers, 2014-2017 Pittsburgh Steelers
Matt Muncy 2007 Cincinnati Begals
Mark Parson 2009 Houston Texans, 2009-11 New Orleans Saints
Quentin Poling 2018 Miami Dolphins
Julian Posey 2010 New York Jets, 2013 Miami Dolphins, 2013 Cleveland Browns, 2014 Minnesota Vikings
Taylor Price 2010-11 New England Patriots, 2011-13 Jacksonville Jaguars, 2014 Seattle Seahawks
Casey Sayles 2017 Los Angles Rams, 2018 Pittsburgh Steelers
Ryan Senser 2008 New Orleans Saints, 2008 Seattle Seahawks
Rudy Sylvan 2007 Detroit Lions
Jordan Thompson 2014-15 Detroit Lions
Thad Turner 2010 Indianapolis Colts, 2010 New England Patriots, 2011 Arizona Cardinals
Ian Wells 2016-7 Detroit Lions
TJ Wright 2007 Cincinnati Bengals
Dave Zastudil 2002-5 Baltimore Ravens, 2006-9 Cleveland Browns, 2011-3 Arizona Cardinals

Now, using that data to answer your question, the following were in the NFL, by year:
2002: (1) Zastudil
2003: (2) Zastudil, Brinker
2004: (1) Zastudil
2005: (3) Carberry, Cox, Zastudil
2007: (6) Byrum, Mayle, Muncy, Sylvan, Wright, Zastudil
2008: (7) Abrams, Cohen, Koenig, Mayle, McRae, Senser, Zastudil
2009: (5) Abrams, Cohen, Mitchell, Parson, Zastudil
2010: (6) Cohen, Mitchell, Parson, Posey, Price, Turner
2011: (9) Cohen, Gatling, Goulet, McCrae, Mitchell, Parson, Price, Turner, Zastudil
2012: (7) Bates, Brazill, Cohen, Keller, Mitchell, Price, Zastudil
2013: (9) Bates, Brazill, Cohen, Herman, Mitchell, Posey, Price, Zastudil
2014: (11) Bates, Blankenship, Brazill, Carrie, Foster, Cohen, Herman, Mitchell, Posey, Price, Thompson
2015: (7) Bates, Carrie, Foster, Cohen, Herman, Mitchell, Thompson
2016: (5) Carrie, Foster, Herman, Mitchell, Wells
2017: (6) Basham, Brown, Carrie, Mitchell, Sayles, Wells
2018: (6) Basham, Brown, Carrie, Mangen, Poling, Sayles

Same list they had in a football program a few years ago. I pointed out to them that they left out arguably the best OHIO NFLer of all time -- Vince Costello. Nice to see that they paid attention to what I told them. I guess I get more respect at the Lincoln Presidential Library. ;-)

Edit: They have guys who played before Vince, like Art Lewis, but left Vince out. Maybe playing for the Browns doesn't count as a real NFL experience! ;-)

I am so happy that Sayles is getting another shot, he was a great bobcat and played great in the preseason games last year. I am sad that brown lost his starting position. I hope that the current nfl bobcats have a great year.

Tarell Basham with the blocked punt.

BLOCKED PUNT! 🚨#BALvsIND pic.twitter.com/xUY1NYFt5o

— NFL (@NFL) August 21, 2018

Not looking good for a few of OUr guys. Poling,Basham,Brown,Sayles and Mangen are fading in Game Reps

Take it for what it's worth, but ESPN has final roster predictions for all NFL teams. Bashem, Brown, Carrie and Poling are expected (according to the site) to make the 53 man squad of their respective teams. Mangen and Sayles are not.

http://www.espn.com/blog/nflnation/post/_/id/280211/final...

Poling and Sayles cut

Poling makes Dolphins Practice Squad. Falcons and Steelers have announced their 10 man Practice Squad signings with Mangen and Sayles not included. Perhaps they will get signed to another NFL team's Practice Squad.