"Coaches help" is an understatement if i ever saw one. Having a coach for the craft you want to build on is absolutely crucial. Not sure how to describe it any better but having a coach vs not having a coach is a big deal on the elite level. I mean, how many world champions can you name won the title without a coach? And what do you mean about not knowing enough about coaches?
And no, he wouldn't be the GOAT coach just because of it. It would be because of the reasons i asked in the OP.
Obviously an understatement.
But a great coach can turn a mediocre fighter into a champ (i.e. Forrest Griffin coach - Robert Follis).
Turning an elite fighter into a champion is a far lesser accomplishment (comparatively).
But as I said, this is not an easy thing to judge.
You would have to analyze each fighter, assess how good (s)he would be without that coach, check his/her adversaries, their own coaches.... there are a huge number of variables, and measuring just by the accomplishments of his trainees is obviously over-simplification.
Besides, I provided you with other gyms/coaches who trained a trio of fighters that were champs simultaneously (Javier Mendez) with DC, Cain, Luke & Khabib...
But then again, is it not easier to train 4 champions in the same gym? (where one fighter elevates the others)?
Maybe a coach that only has one good fighter in his gym and succeeds turning him into a champion (i.e. John Kavanagh)... wouldn't it be a bigger accomplishment?
Look, I am not disagreeing with you, I am just adding food for thought.
I do think many coaches are not even known by the public. There are few that are well known (Greg Jackson, Firas Zahabi, Edmond Taverdyam, John Kavanagh, Rafael Cordeiro, Andre Pederneiras, Javier Mendez, Heath Sims, etc)... There are a few others I could name that appeared in the news, or you might know because of some specific news or fighter you follow...but most coaches are unnamed, unknown. Heck, I know a coach that used to coach BJJ for stars like Silva, Junior and even Nog brothers... but doubt anyone would know his name...
How would you even judge them?