I mean, we’ll just have to agree to disagree if you flat-out think he was a bad defender at Arizona

I think he showed a ton in the way of help defense/off-ball defense. Was consistently making plays and posted very impressive block/steal %s as a freshman. His team was noticeably better defensively with him on the court vs. off. He demonstrated the ability to rotate and offer weak side rim protection that isn’t super common for a player his age. He proved he can guard 2s and isn’t just a tweener forward type guy who has to stick to guarding 3s/4s. On-ball defense wasn’t as impressive but I don’t think he was bad or even average in that regard either. Getting torched by Duke isn’t really a death spell to me.
Flagg is the best wing defensive prospect in the draft, but after that I think Bryant has as much of an argument as anyone.