I saw the signees from rookie-camp, but...[what about Chase Thomas, Kevin Reddick, and Rod Sweeting?]

This depth chart has all the current players that are "under contract".

New Orleans Saints | Roster

So he's 6'0 220lbs and able to play special teams (KR/PR) he could challenge Cadet for that 4th RB spot...that will probably be inactive most of the time with all the linebackers we will have activated on game days now.