athletic ability to switch to linebacker at the NFL level like some other undersized college defensive ends have. So at best he'll probably be like a 3rd string situational pass rusher/special teams player.

After not doing much his first 3 years at Mizzou Sam had a great senior year. Hee played on a pretty good defense that led the entire SEC with 41 sacks. Kony Ealy was the DE opposite Sam and he usually drew the most attention. If you look at the games a lot of Sam's sacks are hustle sacks where a teammate flushes the QB out and Sam's great motor helped him to be in the right place at the right time to clean up. He had 9 of his 11.5 sacks in 3 games against inferior opponents but didn't do much in others.

This article kind of breaks it down:
http://mmqb.si.com/2014/02/13/michael-sam-film-study-nfl-draft/