It is posible he could have accomplished much more, but I doubt it as he seemingly was quite the dumbass. He would not have retired if he was not such a careless/ignorant driver.
No Ibeabuchi had a mental illness, Simon was a danger to society, because he was aware what he was doing was wrong, and yet he choose to continue to do it.
Was lucky to get the nod despite a perfect styles makes fights scenario in his favour against Winky. He was strong had a good work rate but not much in the way of defense or timing or accuracy to his punches. Barring a rock chin ( a bit of an unknown) I think someone like Tito would have blasted him out of there.