THe biggest I think Leach would be a great pickup would be his impact on the ground and pound. WIth Leach starting at fullback, it will allow the run game to be great. Chris Ivory and the running backs would greatly benefit from this. Leach could also be a great leader in the locke room. Being a super Bowl Champion, Leach knows what it takes to win.
Right now on the roster, Tommy Bohanon and Lex Hillard look like the fullbacks. Bohanon was the Jets 7th round pick this season and has some potential. Even with his potential, I think learning from Vonta Leach could make Bohanon into a great fullback.