He lost about 4 years of his boxing life. I wonder if we could have seen a more prime Ali at the age of 26 to 29. Unfortunately I think we didn't get to see the best Ali in the ring. I know some people would say the Cleveland Williams fight Ali perfect prime performance. But who knows what he could he have done in those years he was off. He was never the same fighter after the exile, he changed his approach and style. Fought more with heart than with his natural physical skills.