Greatest boxer ever all weight classes?

Greatest boxer ever all weight classes?
My Pick is Sugar Ray Leonard. Smart , Quick, boxed the top boxers of his day multiple times. Don't say Tyson , a guy that was beaten by boxers not in top 100. Don't say Maryfeather , he always tried to avoid the better fighters.
Mul Ali /Clay
Sugar Ray Robinson
Sugar Ray Leonard
Marvelous Marvin Haglar
Larry Holmes
Rocky Marciano
Tommy Hearns
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Greatest boxer ever all weight classes?
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