"Individual success" is a loaded phrase in a "team" game sport.
For the Knicks to be as successful as the "individual" capacities of their stars should make them, it will require more "team" play. Melo has to limit his time with the ball in his hands on offense -- particularly when he is not really moving -- has to make some more of the passes he has the talent to make, and has to commit himself consistently to defense. He has all the capacity in the world but limits that capacity too often to ISO ball offense.
Amare', despite his athleticism, is dreadful on defense. It does not appear that he has any idea how to play defense and he does not work hard enough on rebounding, which is primarily part of a defensive game. He is just lazy on that side of the court.
We need "individual" improvement from both of them, but that improvement should be manifested in "team" play, not "individual" statistics.
Chandler is fine. We need Lin to be at least slightly better than adequate. Despite his constant movement, I think he tends to spend too much time with the ball. He has to find Melo, Amare' or an open man more quickly. And, in order to facitlitate Lin's passing, Melo, particularly, must do some moving instead of standing in that elbow waiting to start his ISO maneuvers that leave the rest of the team as spectators.