Think about it, last year they didn't have a healthy Ariza and that resulted in walton and radmonavic having to play the bulk of the minutes at small forward. Ariza brings things to the table that neither of them could provide last year
1. explosiveness and ability to get to the rim and finish
2. his defense is WORLD'S better than walton or radmonavic

People keep saying Bynum is the missing piece and i disagree. He's a nice player, but the fact is, the combination of Gasol/Odom is producing better than the combo of Bynum/Gasol, so i think people are overrating Bynum's importance to the team and aren't really noticing the impact that trevor ariza is making being in the starting lineup.