having ariza healthy, would have taken space cadet out of the starting lineup and that makes a world of difference by itself. radmonivic was hopeless on both offense and defense. it was like playing 4 on 5 when he was out there.
as for bynum, he allows us to keep two quality bigs on the court for most of the game. having a combo of bynum/gasol, bynum/odom, or gasol/ odom on the court, while one of the three is resting on the bench makes a big difference as well.