Like I said, get the evaluation right. If you trust in your evaluation, there’s no reason to say, “Well, first round picks bust a lot” as the reason to back out. That tells me you don’t trust your evaluation. GMs don’t think like fans.
I guarantee you that whichever GM takes Williams isn’t saying, “Well damn, I have him as my top guy, but first rounders bust a lot. No deal!”
By the way, my original statement was that saying “We don’t know what X is going to do as a pro” isn’t a legitimate reason to pass on someone. That’s absolutely true, because you could say that about literally any pick ever.