I think the "weak eras" and "great eras" stuff is mostly bullshit. I do use it a lot myself but in reality nobody really has the knowledge to know how truly great an era was, who got ducked/didn't get a shot, how good the bit players were, ect. There's really no way to quantify the quality of an era with any reasonable degree of accuracy.

I think it's just fair to say if you were great in your era, you get your ATG status. If you want to start ranking the ATGs, it's best to use the eye test IMO. And if you fought before the advent of cameras, go fuck yourself.