I doubt Mayweather could have knocked him out. He’s all about technique and points. Never been a KO guy.
“‘Money’ had an unusual fight style. In fact, he was one of the best defensive boxers to ever step inside the ring. He had enough knockout power [to] counter his opponents. But out of 50 wins, Mayweather only has 27 wins via T/KO.
In his entire boxing run, Mayweather performed as an oppressor in a very handful of fights....‘Pretty Boy’ relied on his defensive skills and his extensive counterattack abilities.
But he was never really a knockout fighter. Most of his fights went full 12-rounds, and the American was a fan of collecting points by hitting jabs to the face and body coupled with some right hand strikes.”
https://www.essentiallysports.com/boxing-news-why-does-floyd-mayweather-have-a-poor-knockout-record/