Ok, now this is a crazy theory I thought up. If you all remember Drahmin's ending, he and Quan-chi both stumbled into the Inner Sanctum Chamber.
Drahmin comes out completely changed. Could he and quan-chi have merged together to form a new person (skab)?

Drahmin before falling in was meat and no skin. Skab, meat but with some flesh.

If you all read Drahmin's legend, Drahmin was once a ruthless powerfull warlord. Then he was sent to the netherrelm, where he was tortured for 500 yrs. becomming what he was in DA. After Drahmin comes out (changed) he realizes what happened. He realizes that he has become what he once was but at 50% completion (resone for some skin). while he has quan-chi's power and strenght, its not enough. he goes out in search for another host. Molach comes back with a average but suitable host. Johnny Cage laid uncontious on quan-chi's fortress floor. This was good because it be an easy kill for Drahmin in the chamber. Just as the fusion was to take place, Sonya, Jax, Kenshi, and Cyrax burst in. Moloch and Drahmin flee as they see their obviously out numbered. Speacial force destroyes the chamber and take Johnny to their base of opperations to recuperate.

Drahmin now known as Skab joins up with the dragon king. In return the dragon king promises to complete the fusion with whoever Drahmin (skab) chooses as a host. Drahmin also catches word that scorpion has returned from the dead...

As for drahmin being in the prison, well all this I've written is just a thought. but then again jade is seen in the prison and she's a combatant. Also shang tsung (as an old guy) is seen sitting on the throne in the old mk 1 lvl that shao khan also sat on in mk 2,3,t (i forgot the name of the arena)

I'd be grateful if someone could post a pic of unmasked Drahmin and skab. i saw a hi-res pic of skab (like baraka or subs). if one of you could get that pic that be great. thx