With regards to the Powe/Big Baby issue, the data from the regular season suggests you are incorrect + John Hollinger on ESPN argues that this is one of the biggest flaws in Doc's game planning so far. And he wrote this before Game 6. Is there some data suggesting Big Baby is more efficient?
http://sports.espn.go.com/nba/playoffs2008/columns/story?columnist=hollinger_john&page=Awards_080516Put Me In Coach Award: Leon Powe, Celtics
Besides Kevin Garnett, the Celtics have four other big men. Of the four, Powe was easily the most effective in the regular season, but he's been an invisible man in the playoffs. Though the other three are struggling, Powe is averaging only 15.8 minutes per game in the postseason. In the past two games, he's sat in the second half while Doc Rivers played Glen Davis and P.J. Brown together.
This is a bizarre move. Powe, who gets little fanfare nationally, was one of the league's most effective power forwards in the regular season on a per-minute basis. His per-40 minute averages of 22.0 points and 11.2 boards jump off the page, as does his 57.2 percent shooting. In fact, Powe's 20.97 PER was seventh in the league among power forwards, outranking All-Stars Antawn Jamison, David West and Shawn Marion.
Given that Powe is both abundantly more effective statistically and has a massively better plus-minus in the postseason than Davis or Brown, it's been an odd choice to say the least. TNT's Mike Fratello alluded to five defensive mistakes Powe made in Game 2 of the Atlanta game during a telecast, presumably because Doc Rivers told him this. But one could also retort by pointing out all of the offensive mistakes that could be alleviated by having another frontcourt player in the game who actually scores once in a while.
First, I think Sam Cassell will lead things off since he has played much better at home than he has on the road. However, if his slump continues, expect the C's to go to House in the second half.
To answer your second question, Doc should go with Big Baby. I don't understand how you can call Leon Powe our most consistent big man off the bench. He's been very INCONSISTENT. I'm not saying Big Baby has been consistent, but at least he provides superior inside defense, a better jump shot, and a better back to the basket game. He's also a good passer, and Leon Powe doesn't even know what the word "pass" means.