Greg is a weird one, as it isn't really a "band" in the normal sense, but I would say he was famous for his instructional books and playing live long before he was famous for youtube/wildwood
So he doesn't feel like Fluff, Rabea, etc - the guys who really shouldn't have a signature guitar with a big brand. The cockmaster just feels different than them because he has respectable guitar related stuff in his background besides "worked at andertons in the 2000s"