Regardless, unless Ray, Paul and Rondo all blow up for ridiculous games, we're going to need pretty much a 3 man rotation of KG, Sheed, and Baby with little (if any) other time from any other big. All three are going to have to play north of 30 minutes and KG may have to go 40.
So who starts is fairly unimportant. At some time tonight all three are probably going to have guard Pau and all three are going to have to guard Bynum.