If a surgeon like Gunson is telling ex-M patients that he botched their jaws, then that IMO is verification of bad results.
I have seen one set of M jaw surgery pics where the guy had a lower jaw advancement - it was barely noticeable, and he was pissed. A few months ago, I saw a post somewhere else about M giving some guy nerve damage in the chin.
Unless it's a case of "my crooked nostril ruined my life" aka a rhino board, proof of a bad jaw surgery isn't always helpful - the surgery can be messed up in other ways i.e. leave you in serious pain which can't be captured w/pics.