Sam Sharpe-USA TODAY Sports
OT Emmett Cleary
Anthony Castonzo's former roommate Emmett Cleary was one of the top UDFA prospects, as evidenced by his $20,000 signing bonus, the second-largest signing bonus for UDFAs. He may make a perfect practice squad member, but if he impresses at all in camp, don't be surprised if he passes a veteran for a backup tackle spot.
OT Justin Anderson
One of the Colts' seventh-round draft picks last season, Anderson also had to sit out 2012 due to injury. While he's been ignored for most of this offseason, Anderson may be an underrated prospect for depth on the offensive line. He can play inside or out, and could be a popular name come August.
CB/S Daxton Swanson
Swanson can play anywhere in the defensive backfield and could fill another space in a thin depth chart. Every year there is a surprising UDFA who makes the team—could Swanson be that guy this year?
LB C.O. Prime
Prime got an unprompted shout-out by Cory Redding during OTAs, and if he flies around during the preseason, he just might play his way onto the roster.
DE Ricardo Mathews
The fourth-year lineman played 500 snaps last season, but higher-potential guys will pass him this season. Mathews, however, has talent, and the coaches evidently trust him. If an unexpected injury happens, Mathews can step in and take their place.