We all know Yin and Yang energies are not compatible. And in JY's world, only Bei Ming Zhen Chi and maybe Yi Ji Jing can incorporate all internal energy into one unified energy smoothly. The two handed Yang Guo had pure Yin energy, but when he lost that arm, he started to use pure Yang energy in his adventures. If Yin and Yang are not compatible, does that mean that YG's internal energy with the Heavy Iron(Osmium?) Sword onwards has nothing to do with his Ancient Tomb chi? What happened to that chi? Did his one armed training have a YJJ effect that makes his ancient tomb chi irrelevant?