It was debatable before but now, clearly. Pirog's footwork would cause serious problems. Not to mention just about everything else about him. The guy was brilliant.
Not sure about pirog but Golovkin would have lost to Murray fighting him the way he fought Jacobs. No killer instinct, all channeled in showing people he can be disciplined and not get lit up by a combo when actively defending. Well, he didnt have a mark after the fight, but if it means basically not fighting and never committing to a punch, then yea, Murray would have beat him.