Which player vs which position - two different questions in my view.
I hope and somewhat expect our punter to do much better, though I don't expect a miracle. If he can cut down his bad ones by half and put a dozen or so inside the ten yard line, it will be dramatic improvement.
Wilbon has potentil to be much improved as he has shown so little and appears to have a lot of upside if he plays his best.
We need DPE to play up to his potentil so whether or not his is 'improved' as much as restored idk.
By position, I feel we need our receivers to step up and improve a bunch. We had some good play last year but nothing really 'special'. Hopefully, with more accurate throws, we'll have more catches and more yards after the catch. If those happen, then the running game will make substantial improvement and the offense as a whole will be much better.
The defense as a whole will need to be much better as well. There may not be many individuals on defense who are 'most improved' but the entire unit should be better as they are now into the third year and even with some scheme and alignment changes, they end result ought to be a pleasant upgrade.
One area where we need dramatic improvement and where there is plenty of opportunity to make big strides is the kick return game (kickoffs and punt returns MUST be better if the team is to win more games). We need to field almost every punt and return them regularly for 10 yards. No more letting opponents 'chip and roll' us to death as we stand back and watch them pin us deep. We need the coaches and the returners to get the courage to go and get the ball and not hang back and wait for the 'perfect' one to attempt to field and return it.