Of the 32 first-round picks in this year's draft, only ten were 5-star recruits by 247 Sports, 12 were 4-star, six were 3-star, two were 2-star, and two were NRs. Corey Davis was a 2-star, and I think ESPN said that WMU was his only offer.

http://www.cbssports.com/college-football/news/2017-nfl-d... /

Some guys just blossom later and others get the right coaching.