Unusual fantasy football keeper help

[bosoxfan]

12 teams
You are able to keep 1 player from the previous year but you have to draft him in the second half of the draft and keep him on your roster for the entire season. We take 18 players so it’s not hard to bury someone on the bench all year.

Back up running backs who have the potential to be starters next year is what I’m trying to find. I got Cedric Benson in the 10th round last year. I’m looking for someone like that or a receiver that might be in their second year and going to make their 3rd season breakout next year.

Any diamonds in the rough you can think of?