FWIW some draft analyst named Jared Tokarz posted yesterday that he spoke with Josh Jackson and that he's shooting to run sub-4.4s at the combine. If he pops a sub-4.4 40 with a 40+in vertical, at a legit 6'1, he has to be taken ahead of Ward.
Marble has seemingly gotten more explosive with every year he's been at Iowa- not surprising given how young he was when he came in. We saw it a little more with his dunk on Sampson and another attempted dunk on somebody else last year, and I think he is even getting more lift on his jump shots...
Also something to consider- Canzeri is a high level athlete that is receiving top notch rehab services. It probably doesn't hurt that he had his surgery performed at a top 15 orthopedic hospital in the country. All of these factors likely make it more conceivable that he is ready to start...