My thoughts concerning the upcoming Mayweather vs Pacman2 is to discard the news because Mayweather and his camp have not to say anything about it and they never want to accept the offer. Besides, if Mayweather chooses not to fight Pacman then what will make him change his mind now?
Looks like the invitation was coming from Mayweather's side per OP's post, therefore Mayweather and his camp knows about it. The only question now is, is this news reliable enough?