BBBLP
Robot Rock
I don't get it why people think Noob Saibot is actually 2 different entities... I mean, yes, in his noncannon MKA ending, Noob Saibot encounters a shadow of his past (his ending heavily implies that it is just a memory) inside the pyramid. Noob Saibot is Bi-han with black clothes, shadow powers and loyalty to Quan Chi, not a demon living inside the original Sub-zero's body; as Scorpion is Hanzo Hasashi with spectral powers and blind rage (and loyalty to Quan Chi, at first). Also, I can't see Noob's shadow "clone" as a separated character, it is like he is an "extension" (like a limb or something) of Noob Saibot, hence, it is himself. Therefore, the distincion of "Noob" and "Saibot" being actually 2 beings with the exact same motivations is erroneous to me.
With that being said, I really don't like the theory of Noob being splitted. I could understand it perfectly if Noob redeemed himself and became Bi-Han once again. He was always Bi-han, not some demon fused with him, as Scorpion was always Hanzo, not a demon fused with him.
With that being said, the best possible scenario for me: Raiden and Earthrealm warriors free Sub-zero's Soul from the netherrealm. Since he is now a soul, it would make more sense if he recovered a human body.
It was never revealed how Quan Chi made Bi-Han into Noob Saibot.
For all we know, Saibot could be like the Symbiote from Spider-Man.
Weak on its own, but when combined with a host, becomes a powerhouse.
Quan Chi could have just combined Bi Han's dead body with this demon.
Its just like Venom, Eddie (Bi Han) thinks that he is in control, but Venom (Saibot) can take over at the drop of a hat.