I don't know if Dez is a good comparison, because Amani has the ability to play inside with backers as well. He'll be that perfect 4-2-5 guy that allows teams enough personnel flexibility to not have to constantly sub or get caught with a bad package on the field. With his speed, some teams may want to try him as a 2 high or even 1 Robber safety.
Plus, Dez is elite at covering the slot right now, and was in college as well. While Amani is good there as well, I think that role would be limited compared to his skill set.