James Micahel McAdoo played a total of 1 minute 12 seconds in the Finals and was -1 in that minute, so no he did not help them win a championship.
The Knicks didn't win a championship and even if they had, John Starks was not a d-league player. He was on his 5th year playing NBA ball. So you're wrong on both accounts.
Therefore, all of these posts/threads about d-league players are a complete waste of time. If we want to improve the team to win a championship, we will do that via trade, signing a quality free agent, or getting lucky in the lottery. Not by wasting time (and money) trying out scrubs.