The Knicks need a point guard that can orchestrate and develop plays in the worst way, and, unfortunately, Iman Shumpert and Toney Douglas are not cutting it. (In all fairness to the two of them, they are both shooting guards by definition, and they are being forced to play a position they are not comfortable with.)
Amare Stoudemire clearly looks uncomfortable on the court, and having a point guard like Davis on the will help STAT to use the pick-and-roll play like he was so successful with in Phoenix and with Raymond Felton and Chauncey Billups last season.
However, Knicks fans need to know that this will not work overnight. Don't expect the Knicks to be a great team the second Davis takes the court, because it is neither fair nor realistic.
This team does not look good now, largely due to isolation plays and poor shooting and way too many bad three-point shots.
In theory, Davis could help in those area. He will help with ball movement, shot selection and he is a good shooter himself.
Having Davis on the court will allow for Shumpert to move to the two spot and split time with Landry Fields, causing a better lineup for the Knicks.