Look up the percentages, best offensive and defensive rebounder in the draft.
Even if you're going to disagree, he's the third best? GREAT pick and a great rebounder. That's the one thing Sully will do no question.
Total Rebound Percentage
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5. Thomas Robinson-KS 21.4
15. Miles Plumlee-DUKE 19.8
... Jared Sullinger 18.2
I think Sullinger beat one of those guys in ORB, and the other in DRB, hence the "best rebounder in the draft" claim.
Basically, but the claim is flat out wrong if you phrase it that way, because those guys all got more total rebounds.
Most versatile rebounder in the draft if you really want to put it that way.