With the extra point guard on the court, the Knicks can look to score more off the pick-and-roll, which should force the Celtics to scramble to rotate. The Knicks would also be more likely to make the extra pass. Woodson said the offense in Game 1 became too stagnant at times with Felton as the sole point guard on the court. While Felton played well, the coach said Prigioni was "definitely missed."
But here's the question: Can a smaller Knicks lineup contain the Celtics? With Felton on Pierce and Shumpert on Green, Doc Rivers could call more isolation plays on the perimeter and in the low post. Woodson would likely have to send an extra defender at the Celtics' two best scorers, which means the Knicks' perimeter rotations need to be on point.
This is obviously going to be one of those chess match aspects of the game, but I'd much prefer to see the Knicks initially forcing Boston to adjust to them, rather than the other way around. If the Celtics' bigger lineups causes problems, the Knicks can always adjust, but given that New York happens to be the better team, I'd be reluctant to go away from what they do best unless Boston really forces their hand.