Mcgregor has never fought more than five rounds in ufc rules, how will he survive in a sport which is more physically demanding.
Have you watched any MMA? You do realise that these guys wrestle each other, get kicked, thrown around, pressed up against the cage, and then punched on top of that. To call that less physically demanding than boxing is a stretch at best.
it's not necessarily less physically demanding, it's just WAY different.. I mean it's like elite 400m guys vs 800m guys. And in terms of speed, it's like a world class tennis player vs a world class ping pong player. I'm not saying boxing or mma are one or the other, in those examples I gave.. I'm just saying that elites in each sport, are going to have a serious problem transitioning into each other's sport, even if they are more similar than not.
If PBF had to grapple on the ground, he'd gas easy. Conor isn't a pure boxer, I mean he gassed against Nate Diaz IIRC. He's going to be in there, for his first ever professional boxing match against one of the greatest boxer's of all time, who is presumably still in amazing shape. Floyd is dedicated beyond belief, probably still dedicated in retirement too.
Also, never fought more than 5 rounds. 5x5 minute rounds that is.
Definitely, 5x5 is serious..
He's fought 0 rounds in a pro boxing match though, against a guy who has never gassed in his entire career, and is known for sparring non-stop without rest breaks while they throw fresh sparring partners (pro boxers) in there with him.
Everyone seems to forget that Conor got outboxed (in the 2nd round) by slow as hell - but good boxer, Nate Diaz..
http://www.youtube.com/watch?v=_STTttVqXjsI mean he got caught several times, rocked, then choked out. Nate Diaz is slow af... but he's also tough af with decent boxing.
FWIW, Anderson Silva actually has a professional boxing record, he's 1-1 with 1 KO loss.