Listening to Robinson Cano talk after the game (in barely comprehensible english) about a new focus, I can't help but think back to Melky.
This is purely speculation, but I really do believe that the Yankees were dead set on getting rid of Melky this offseason for a variety of reasons.
The first of which is obviously that he was able to net them Javy Vazquez, but I think there were two big underlying reasons.
1. They wanted to free up a lineup spot so Brett Gardner, who the Yankees probably recognized as a superior player to Melky, could play everyday.
2. I really do think that they felt getting rid of Melky would allow Robbie to take that leap into the upper echelon of the league.
It has only been a month, and I obviously can't prove that his focus has improved without Melky on the team, but it certainly couldn't have hurt.