The fact that people are still debating the level of his achievements from both sides of the argument decades later is testament to the depth of his career alone. The guy fought everybody in arguably the best heavyweight era of all time. Not only were there so many great fighters in the division but they all had completely unique styles and characters of their own. The craziest thing for me is I have still never seen a fighter move as beautifully as Ali did in any weight division and this guy was doing it as a fucking heavyweight