Did Pac cycle off as a test before facing Mayweather?

Hopefully this thread won't get closed but is it me or did Pac look way less muscular then he usually is? His back wasnt as ripped as usual and his punches didnt have the pop or snap that they usually do. I was thinking that he stopped taking whatever he was taking because he wanted to test how he'd look so he can take the Mayweather random tests. He probably figured it was safer to stop taking that stuff against a guy moving up and who he THOUGHT wasnt a threat to beat him. Just my 2 cents. What do you guys think?