In my opinion, we can't rule it out. Against the best fighters he's fought, Byrd and Tua, Ike showed excellent qualities: power, iron jaw, stamina, a high workrate, very good timing and constant pressure. It would have been a very interesting matchup against Lewis. But the first quality you need to become a great champion is your mind, unfortunately, which is exactly what Ibeabuchi lacked.
If you had a mentally stable Ike Ibeabuchi, then would he want to punch people in the head for a living in the first place? Would he even want to be anywhere near a fight, let alone be as ruthless as he was in a prize ring? Ibeabuchi was always mentally unwell, it is part of the man that he is, and to take the away is to conjure up a totally different person.