Pacquiao has slowed down because he's aging and because he has cut down on his PED use in order to prepare himself for the Mayweather fight for which he will be forced to stop using
Pretty sure JMM is on some sort of PED's. The evidence above suggest that. Also I believe JMM believe's Pac is on PED so why shouldn't he be, and if the PED's helped Pac climb weight like that then it will help him too and yes it did. Regardless, I dont care. JMM relies mostly on his technique anyways and if he did do PED, its just so he can handle the weight as well as Pac does, then it comes down to who is the better boxer. Physically, speed, power and strength Pac still holds the edge so its not like JMM took away Pac's advantage. It just means he wont be coming into the ring like he did against Floyd, a bloated LW.
honestly marquez might be roiding, he does sort of have that bulky roid look going for him lately. But since pac is roiding his ass off is it really cheating? They are both on the same stuff most likely.
HGH doesn't make you faster. JMM gained lean muscle and was more flexible with his waist, and quicker on hand & foot.
conte says HGH only helps with recovery and that he wouldn't bother with it although the recovery allows for more training, whereas unlike other PED's it doesn't increase your strenght and speed/overall athleticism the same