Originally Posted by
tape
Officially, I don't think ZBT reached Great status until after he met Gou Jing -- the fact that he had unrealized potential shouldn't really matter much.
Linghu Chong for example is probably many times more powerful even before Dugu 9 Jian, from the simple statement of Feng Qingyang that he is allowed to adapt his moves. Yet we can't really say that he was just as powerful before then.
Yang Guo reached a higher level from GWM's advice to concentrate on his own personal form rather than using bits and pieces of everything else.
Arguably, Guo Jing had huge potential before he met Hong Qigong since his power increased many folds just from learning one stance in one day.
There are many characters that only needed that one sentence of insight to bring them to a much higher level, and until that happened, they could have struggled for years before reaching some sort of breakthrough. So no, ZBT was not equal to the greats before Guo Jing even if he had the tools to be.