I feel that it works both ways - Take a good Athlete, like, a really good willing serious Martial Artists and dump them in a bad Dojang, and theyll eventually develop. Dump them in a good Dojang, and they will develop further and faster.Actually Twin, I have met a couple of them. There are two, that I know of who have moved over from ATA to USAT and do very well on a national level. One that I know will compete at US Team Trials in April.
I have always felt it is really the athlete, not the "group" that makes a difference.