Impossible to predict once all the top guys are out and currently nobody stands out from the prospects enough to be a clear choice. Jalolov would be my choice if he ever commits to being a pro but I doubt he will so Itauma right now is the most impressive prospect at heavyweight for me, so he's my choice.
In 5 years Dubois will be 31. Easy to forget just how young he is now. Yes he has limitations, but it's hard to see past him right now, IMHO.