I think Perriman will have to split too much of his playing time with the vets.
Tight end is a tough position to make the transition from college to pro. Heap and Pitta didn't really shine in their first year so unless Maxx is a superstar, I don't see him making the biggest rookie impact.
Carl Davis will get in the rotation and have a chance to show his stuff.
Tray Walker has too many vets in front of him to really shine.
Za'darius Smith has to sit behind Doom, Sizz, and Upshaw. Not much chance for him to play.
Buck Allen is 3rd right now on the depth chart and that's not counting Juice.
My guess is Carl Davis has the best chance to make the biggest impact this year.