Kinda hard to say. Crazy Ike never went up against a guy with Fury's size, but Fury never faced anything like Crazy Ike. We know for a fact that Crazy Ike wouldn't be timid like Wald, and while Ike didn't have the one shot power of Wilder, he was a HELLUVA lot more skilled than Wilder. It's hard to say with certainty since we never found out Ike's truth worth, but I suspect he would have beaten Fury. I don't think Fury could have deterred Crazy Ike at all.
Hard to call because Ike never quite dealt with somebody like Fury. Chris Byrd made him miss for a while but it wasn’t enough. All depends on Ike being able to get consistently inside to do enough damage. If he can’t, he gets outboxed but he had the power to turn Fury’s lights out as well. Pick em.
Ike was overrated ... I don't think he hit that hard either, regardless of the Byrd stoppage ... he was more fluid than Joshua, smoother but he was hardly some stylist ... he could maybe win just based on working (his stamina was actually quite impressive) but I don't see him as some big cut above any of the current trio