My take is D.Will is not adhereing to the structure of the offense and defense. Great athlete but he is not "getting it" while his team is.
As the knicks progress the flow of the offense becomes instinctive. Early the team was still finding itself and MAYBE (me guessing) was not in structure as much as it has been. Basically as the season goes on the team gets better at the offense and defensive schemes and the team is more structured. D.Will has been bypassed and thus is thinking too much which is never good. If he is missing assisgnments and pissing off all those around him its not a good thing.
You can see it yesterday. KP was in the flow of the game and everything he touched was wonderful even if it was a miss. Dwill comes in and he is getting offensive fouls, forcing things. Dude has to let the game come to him.
Not all signings work out and as much as He wants to be here and buy into he might not be the right fit. No big deal, its not a toxic contract and only for the year.
70 games to still work in.