Per this thread:
https://csnbbs.com/thread-968322-post-18884615.html#pid18... Current portal departures;
Akron 15
Ball St 9
BG 5 including #2 RB
Buffalo 8 including starting QB, leading WR
CMU 9 including starting QB
EMU 5 including starting QB
Kent 15 including starting QB, #3 and #5 receiver
Miami 4 including backup QB and their kicker
NIU 5 including leading receiver
Ohio 6 including starting QB, #1-2 receiver, #1-2 RB
Toledo 4 including starting QB,
WMU 16 including #2-3 QB
Note that I did not check detail on all the players, only the offensive skill positions. Thus, some of the teams may have lost starting linemen or starting defenders, and I would not have noted it above.
Ohio is one of the best in terms of quantity, but was heavily hit in terms of offensive skill position players.