Commander
Well-known member
Jerrod had FAR more political power over Edenia than Argus, plus the former's soul is contained within Ermac. On top of that, Rain is an illegitimate child of Argus; historically, illegitimate children were completely excluded from the line of succession. Ermac is the rightful ruler of Edenia.
Jerrod's soul isn't the controlling soul in Ermac's body, nor is it the ONLY soul in Ermac's body.
There are 999 other souls in there, as well.
Arcade ladder endings are hypothetical until NRS decides which ones will and will not come true for MK10.
If the MK9 ending is anything to go by Ermac more than likely gives less than 2 shits about ruler of Edenia, and is probably just happy to be free of Shao Kahn's power, once and for all.
The main story is what dictates what will happen in MK10, not ladder endings.
If MK9 ladder endings dictate the outcome for MK10 then Sub-Zero is still alive, Liu Kang is a god, Smoke is a demon, Sheeva is the ruler of Australia and all the other bullshit MK9 endings are also true.