Maybe, just maybe ,if Ibeabuchi can absorb early punishment, his chin is the key here. See if he could force Tyson back, something very few could. Take Tyson in to deep waters ,break his rhythm with his physicality and high volume punches. Then he might be in with a good chance. But it's prime Tyson, easier said than done.
I don’t think any of them beat him, but if I had to put my money on a horse it would be the clinically insane guy from Africa. Ike vs Mike in a prison fight — take ‘em both off their meds for a month or two, no rules, one of those where the guards sit back and look the other way — might be more interesting.
He only provided a small sample size of his ability but I'd go with Ike as well. I could see Tua shelling up or at any rate Tyson would simply be too good for him. He could stun Tyson in the early exchanges when Tyson attacks with fervour. I don't think Joshua would be up for beating Tyson mentally. By no means would i expect Ike to win but he's potentially the most dangerous IMO.
I can see Tua clamming up, he'd survive to the end but lose unanimous. AJ would be brave but battered before the fight half way through.
Ike had slow feet but okay head movement and handspeed. If he catches Mike (which is unlikely) with an uppercut a la Chris Byrd he could pose some trouble.
I think Tua would simply be beaten to the punch early and repeatedly, and the length of the beating would be prolonged only by the solidity of his chin.