Would he have gotten significantly better had he stayed for another year? Would there be significantly less available talent in next years draft?
I don't see any reason to answer yes to either of those questions. As much as I would love to have him back another year he wasn't going to prove anything that he hasn't already. There are also a lot of underclassment in the draft but there is no reason to think next year will be much different.
If he had stayed one more year he wasn't likely to make a lot more money and would be giving up potentially one season of getting paid. Add in the risk of injury and it's hard to argue that he didn't make the right choice.
I don't see any reason to answer yes to either of those questions. As much as I would love to have him back another year he wasn't going to prove anything that he hasn't already. There are also a lot of underclassment in the draft but there is no reason to think next year will be much different.
If he had stayed one more year he wasn't likely to make a lot more money and would be giving up potentially one season of getting paid. Add in the risk of injury and it's hard to argue that he didn't make the right choice.