I do believe if his illness was diagnosed and controlled early enough, Ike would of been a heavyweight with decent power, a solid chin and little more.

Now 'just' having them virtues in this Heavyweight era maybe good enough to sneak a world ranking, but back in the 90s the quality of the Heavyweights was such, I suspect Ibeabuchi would have at best lost a fight to a top contender, then been an 'opponent' for future contenders.