Bi-Han has no reason to go back to the Lin kuei and become grandmaster there all cyborg's and if hes champion of the Elder Gods why would he want to go back to the Lin Kuei
I never said anything about him going back to the Link Kuei, just being the Elder God's Champion, which those lines by Raiden and Sub-Zero are STRONGLY hinting at.
Since you bring it up, though, who's to say that Bi-Han doesn't come back and DESTROY the Lin Kuei (rather than joining it), similar to his MK9 ending, for the reasons of the Lin Kuei being partially responsible along with Quan Chi, for killing his and Scorpion's family???
Plus the whole Bi-Han is separate from Noob really started with his Armageddon ending (non-canon might I add).
Which Ed Boon MADE canon, when he said that Noob and Saibot were 2 separate beings in MK9 (might I add).
Since we are using that as a basis though Kuai's ending also had him become so powerful that he became an ice god.
That ending was never made canon by Ed or anyone else at NRS.
So, let's say he helps defeat Shinnok. Maybe that grants him a power boost.
Then, he gains the dragon medallion. That's another power boost.
Then he gains the cryomancer armor. That's a third power boost.
That would allow him to then achieve a lesser god status such as Raiden.
All of that is a BIG
"IF," considering that Kuai's under Quan Chi's control, where as Bi-Han wasn't stated as dead in MK9.
I could easily see it being Bi-Han or a NEW Sub-Zero before Kuai goes through all of that, which you just mentioned.
Perhaps outworld's throne is not the only one up for grabs. After Raiden's mistakes in MK9 perhaps the protector status is up for grabs as well.
Perhaps Bi-Han escapes the Soulnado, just as Scorpion was able to do.
He then meets the Elder Gods, accepting a new role as the protector of EarthRealm, due to Raiden being an incompetent EarthRealm protector.