Hard to overate Benny Leonard. I wouldnt give someone shit that had him #1. Its all subjective. Some people put stock in different aspects of a fighters career.
We know Leonard is among the very elite that has ever laced them up. He dominated the lightweights and couldve won the Welterweight title had he chose not to hit Britton when he was on the canvas..
Thats a whole nother story.
The man retired on top of the sport.
When you look at his ability what was he lacking? He could box, punch, take a punch. Benny had superior footwork, educated movement and according to Ray Arcel he could fient you into knots. He could KO his opponent with either hand.
I basically described Ray Robinson but all those same attributes apply with Mr. Leonard.