They are all the same person, however if you are wearing multiple meat suits with their own identities, you are naturally going to try and act similar to those personalities to avoid suspicion, though I do suspect he does Jedi mind trick shenanigans on those who he is truly weary of.So how weak is he now that hes destroyed his body and is only alive in soul? And whats up with the six desires stuff? multiple personality and all that. As six desires, its clear hes stronger than Wu Heir and Ruo combined. He was weak when he was Yuan Fang and decides to use his token when he's almost in deaths door due to Chu Muchen beating him up. He doesnt seem that strong except for his mind attack when he's in He Gang's body. We dont know yet how strong he's in YG's body. How is all these three different from the six desires? They're the same person right?
One of the dialogue options for example is you can point out to Butterfly that it is suspicious that "He Gang" was able to trap a recollection of TWs voice in a bottle. To which she finds it suspicious for a few seconds then quickly concludes you are trying to disparage him because you don't like him.