Dan John has squatted 275kg for a triple, benched a bit over 400, and deadlifted somewhere in the low 600s. That's not uniformly stronger, but it's pretty strong. I believe he's C+J'ed 385 and snatched 314. But what he's really good at coaching is throws and S&C for throwers, so I think it's very fair to note that he's not the best guy for powerlifting specific training. He's more S&C for athletes who benefit from strength (eg football, throwers...). He's a better thrower than lifter and has coached people to success in throwing. He's been a nationally competitive thrower and got some master's records in throwing of some sort or something like that after he was no longer nationally competitive.
I don't actually disagree. But I think that the ability to look at a person, figure out what they need to progress, and then figuring out how to get them to actually do it, is a seperate skill than getting yourself to be great.
To use the examples here - If I wanted to be a world class powerlifter, I'd pick Louie Simmons over Dan John. But if my choices were some one who has coached a lot of people to pretty good levels and someone who has only done great themselves, I'd pick the guy with coaching experience and a track record. Now, obviously, this assumes the choice is binary. What'd I probably do is work with different coaches until I found the one I want.
But to use Lewis as an example - despite this claims, most people that are at his level in powerlifting don't lift like he does. And it's absolutely possible that he's right, and if they lifted like he does, they'd be more awesome. It is also possible that they would burnout and regress. Because we don't really know if Chaos and Pain works for other people the way it does for him. Whereas while Westside doesn't work for everyone, it does have a track record.
We're pretty much in agreement.