What do you think practice is for? Do you honestly think gametime is the only time you can develop an NBA player's game?
This is what young players need to do. Mosgov obviously wasn't comfortable with the NBA game early on and it was extremely obvious with his play. He then worked his ass off in practice and with coaches so he could get more used to NBA ball and take advantage of another opportunity. How the hell can you say that the Knicks haven't been developing him? Do all NBA players not named Eddy Curry just twiddle their thumbs in between games?