Firas Zahabi says Conor McGregor's Cardio Problems are Genetic

Firas Zahabi said, on the Joe Rogan Podcast, that

“If you have a fast-twitch muscle fiber, you can hold less oxygen, but it can twitch faster. Hence the name. So, if you’re a slow-twitch muscle fiber guy, you can metabolize more oxygen, but you can’t twitch as fast. So, there’s a give and take. So you have a guy like Nick Diaz who needs to knock you out with volume. He can’t knock you out with one shot. Look at B.J. Penn. If round one, he doesn’t knock you out, the likelihood of him knocking you out in round two is less. Diaz is the opposite. The likelihood of him knocking you out in round three is higher than round one, because of the cumulative attack. McGregor, look at his stats. It’s all round one knockout, round two knockout (using) his fast-twitch, high-leverage left hand. If you take him into deep waters, his fast-twitch muscle fibers cannot metabolize with Mayweather. Mayweather’s so smart, he let McGregor work for three rounds. ’I knew you’re getting excited, keep working. And when you have nothing left, I’m gonna put you out.’ That was such a brilliant strategy.”

I find this difficult to believe. I agree that it is a factor, but it comes down to training, and strategy. I do agree that Conor tends to empty his gas tank, but the problem is he is throwing too hard and if the guy doesn't go down he keeps throwing hard rather than using his speed, and footwork to touch the opponent and rack up the points.