I'd put it between Hrgovic, Dubois, and Ajagba. Hrgovic may be the best right now, but Ajagba and Dubois are more raw and may develop a lot more than Hrgovic probably will -- their theoretical ceilings may be higher. However, I think Hrgovic is guaranteed to be in the top 10, likely even the top 5, overall in the next few years.
Any reason why you've left off Dubois? 22 year old still, granite chin, carries power and 7 years younger than dychko, 5 younger than hrgovic and yoka? As a prospect, surely he has the potential to go furthest and hone his game the most
Hrgovic and Dubois are better than any of the others. I'm eagerly awaiting seeing them fight top ten contenders.
I'm looking forward to some of these prospects coming up and knock on the door, sooner rather than later. Ruiz gets a pass, but I'm a bit fed up with the AJ/Fury/Wilder era. The Fury/Wilder rematch has been a long time coming and either of them fighting Joshua if he wins against Ruiz is probably deep into next year or the year after or never. Hopefully this next generation will be more inclined to take on the other belt-holders/top tier opposition.
He was ranked in the top 50 alongside Ajagba and rightly so. He hadn't beaten total bums and was building up his resumé. He's not a knockover opponent, he's skilled and tough as hell.