1. Matt Elam:
Matt Elam was the Ravens first round pick in the 2013 NFL Draft. It looks like that was a horrid mistake by Ozzie Newsome. Elam was a sensational player with the Florida Gators, but he has been a disaster with the Baltimore Ravens. Elam showed signs of being something in his rookie season. The problem however is that he has been out of position often.
Elam sat out the entire 2015 season due to injury. Forget about Elam proving that he was worth a number one pick. It is more than likely that he will never be what the Ravens expected him to be. That being said, he has a chance to show the Ravens he can provide value.
These are the players that are most desperate to prove themselves in training camp. These are the players that have nothing locked up and no assurances of a job. These players have to prove themselves just to make the active roster.