3) R-Truth

R-Truth’s days on the main roster are numbered. His recent split with Goldust showed us that the former US champ still has a decent run left in him, though, and a run in NXT could really help, especially if the veteran was used to put over some fresher talent.
Sitting on the main roster, Truth is basically just a comedy act/jobber who is waiting to retire. A run in NXT could allow his character more freedom and could give the guy some real ring time before he finally hangs up his boots.