Teams always sign a lot of WRs, for camp bodies, as QBs and DBs need someone running routes to practice with.

So basically you need a lot of camp legs and your need to keep your top guys rested.

Also, Will Sheppard failed his physical with the Buccaneers, didn't get signed after working out with the Broncos. And ran a 4.6 in the 40. I think it's just another camp body.