Can't blame him at all. I think he could go 1st round. "Could" is the operative word. If he comes back for another year, learns to shoot free throws, and increases his repertoire of shots/moves in and around the paint, he WILL be a lottery pick next year.
My prediction is that he'll do well at the combine, impress the pro scouts and put himself in an even better position for next year's draft.
He'll return to KU, shoot 50-60% free throws, shoot a lower percentage (he'll get more shots, but will take more shots from beyond 23 inches from the rim) and be on every conceivable "big guy list" for national honors.
That said, I'd say that there's a 20% chance that he does well enough in the combine to feel secure enough to go become some team's 2-3 year project like Embiid was. Embiid, however, had a whole lot more going for him from a skill perspective when he left and 100% of the risks were about his health.
