I don't doubt that this guy was a once in a generation player when he was healthy. He showed major flashes of brilliance, dominant defender, developing offense player.
No doubt would he be challenging Howard as the best center in the league if he wasn't as injury prone as you can get.
He's not a Sam Bowie, he had tremendous talent, but will forever be a giant bust because Kevin Durant came after him.
If you read his Wiki, he had THREE microfracture surgeries already and he's only 24. He also had arthoscopic knee surgery. Crazy.
Question is, will he ever play another game?
He's sitting out this season to rehab injuries, his third straight season missed.
He's only 24, so I bet money, sooner or later, he will. Whether or not he can resemble anything close to an All-Star if he puts his injuries behind him (ala Grant Hill) remains to be seen.