That requires a lot of speculation. Ray Robinson as a middleweight doesn't look like an all-time great fighter to me. There is zero WW footage of SRR.
that's sacriligious my friend.
And there is some footage of welterweight Sugar Ray Robinson, not lots of it but some. Also, we have some great amateur footage. As a middleweight you can still see a diminished version of what made him the greatest ever and even then, that is when he was at his peak of popularity and beat many good fighters. Leonard was an all time great, but as you'll see, many of us did not like him just as fight fans. I don't like leonard but that wouldn't stop me from putting him in the top ten of all time. But top 5?? No. He was something, and who knows how much better he would have gotten without the injury. I would have loved to see him beat down the young guns Curry, Mccrory, Honeyghan and rematch with hearns but more than that, I would have loved to see him fight Marvin when he was still close to the top of his game.