With all due respect...I have asked this before and I ask again...What is your boxing history? I understand that it is natural to think most highly of the guys you watched as you learned, I did that myself...
If Mayweather were to fight Robinson, he would not be able to lay back and pick his spots. He would have to fight. When he fought, he would get hit and hurt. Then he would get defensive. Robinson would probably stop him, though Mayweather could hang on to the end, if he kept within himself. If he fights, he gets stopped, and he'll have to fight.