Carlos Palomino said he believed he would have beaten both Pacquiao and Mayweather. Roger Mayweather say he was the greatest Latin boxer ever and would have been very tough fight for his nephew. I remember during Canelo vs Cotto, Roy Jones commented on a very crafty move Canelo pulled off he said he thought only himself and Roberto Duran could do.
I know Vinny Paz said even though he beat an old man in Duran, that he still was the hardest puncher he fought.