I'm not a Connor fanboy by any means, but boxing Stans give Mayweather too much credit without keeping the ruleset in mind.
They need to watch the fight, and realize that Mayweather's best defense? What not the Philly shell, was not footwork, was not head movement, was not parrying, or any boxing "technique".
Mayweather's best defense against Connor? Was turning his back and leaning over as if he was getting prison f***ed, until the ref broke them apart. It was simply the ruleset that saved him. Under any other circumstances, Connor kills Mayweather, and that's coming from someone who despises Connor as a person