I've always sat on the slightly conservative side which Ike but it's obvious he had some pretty scary potential. The guy not only outpunched Tua but he also tracked down and smashed the slippery Chris Byrd. That's some solid versatility right there.
Much as i like Usyk, its hard to see him keeping a lunatic like Ike off him. I highly dislike Ike as a person but he likely beats everyone today except maybe Fury. He would maul Joshua, likely track Usyk down like he did vs Byrd. Fury may be able to decision him but Fury would have to go through a lot to do it.