Javier Mendez tells Ariel Helwani that Herschel Walker is the best athlete to ever walk through the doors at AKA. That’s a pretty high compliment considering guys like Cain Velasquez and Josh Koscheck train at AKA. Mendez does however say just because Walker is a tremendous athlete doesn’t mean he’s a high level mixed martial artist. He’s still green and has a lot to learn.