Like I said in another topic just the fact of Baron Davis being in NY a competent PG will solve a lot of problems.
The balls outta Melo's hands, like you said Melo isn't Lebron, Bird, or Pippen he's not a point forward he's a scorer and he needs to be spending most possessions getting to his sweet spots, fighting for post position, and just finishing not creating
STAT and Chandler need a play maker to play at their full potential not to mention the fact that STAT is not like Melo he's a real iso player he needs the ball in motion his sweet spots.
Iman Shumpert is not a starting NBA PG he is a SG thats better suited to play off the ball. Like Shumpert Fields is a off the ball player he needs to get the ball in motion coming off screens and cuts.
I think Tony Douglas will be fine he just needs some more good games off the bench to get his confidence up.