While the injury angle is valid, you're still re ed. Bynum was absolutely playing like a top 5 center before he went down. You do realize the Lakers were the number one seed at the time right? Did you miss the game where he held Duncan to 5 points? Or where he dominated Kaman, Amare and Bogut?
Bynum at TWENTY YEARS OLD is already a better defender and rebounder than Yao Ming. If you think that doesn't mean anything then you know nothing about basketball.
Funny how you don't mention Oden when he hasn't even set foot on a NBA court yet they put him at 8. Bynum HAS PROVEN he can play a dominant level. Maybe you should watch basketball that doesnt' involve SA sometime.