what exacly would be so bad if pac joined mayweather promotions for just that 1 figh

ok so here me out,, manny supposedley wants the floyd fight now )after years of refuses drug tests but thats for another story,) floyd wants to beat the brakes off manny roach wants it,mayweather sr/roger wants it that makes to willing parties,,,only problem is that arum doesnt want his cash cow to leave behind a career like that only to get copmpletely dominated and outclassed in a shutout by floyd because he knows mannys little whats left of his drawing power will be all gone,,and thats less money in arums pockets, manny should man up and brake free from his contract with top scrape and tell bob that hes being his own boss and will come back and join top scrape after the floyd fight is finished,, its clear as day that arum will not work with haymon or mayweather pomotions so its best if hes left out and floyd already know that, BUT if manny can make a promice to bob and say that he will come back to top scrape after the Floyd mega fight then maybe bob will abligue, im almost certain floyd would allow manny to sign a short term,1 fight onlycontract with mayweather pomortions for just that one fight to since manny is still the second bigger draw in the sport no mater his decline. what do u think?should manny do it?or at the very least considerit?