If the fight is on the dull side it'll be because PBF decides to put on his track suit and jogging shoes
I don't think many people like that style of getting on your bycicle but still, its not illegal in boxing. That style seems to have gotten Mayweather where he is and he keeps winning with not a single scratch to his face and many times even knocking out his opponents. Almost like a Whitaker style but with KO power.

he won't want any damage in preparation for another huge pay that awaits at the end of the year
Either that or he'll try to beat Marquez in a convincing way to send his message back to Pac "Yes, Pac beat Hatton in 2 rounds while it took me more than that...I beat the man (Marquez) who 'beat' Pac twice in a convincing way".