My understanding of the Posey substitution had absolutely nothing to do with small ball. Perkins was the worse free throw shooter on the court and Doc simply removed him because he didn't want Detroit to start purposely fouling Perk off the ball to send him to the line.
It was obvious that it was going to get into a free throw shooting contest very quickly and I thought the move was good. Besides, Wallace was playing out at the three point line on the Detroit offensive sets late so we really only needed one big in anyways.
I thought it was a smart move, looked at in the context that I saw it.
I think with two minutes left, it was probably too early for that particular strategy. Perk shoots around 65% from the line; I'll take that over the empty possessions the Celts were coming away with at the end of the game.
But again, I don't blame Doc for trying to get Perk some rest at the beginning of the fourth, or for taking him out at the end. He didn't score a point or grab a rebound in the 7 minutes he played in the fourth, and he committed two fouls and had a tech. He had a great game, but he was losing his touch a bit at the end.
I truly appreciate Doc playing the starters heavy minutes this game. For Game 6, though, I think he has to find brief moments of rest for some of the guys, particularly Perk and Rondo. Not much, but a little more than in Game 5. I'd suggest giving those spot minutes to Eddie and Powe. Overall, though, the strategy of riding our starters is a good one.