Thank you for all the feedback for this topic.
I kinda hoped Larian would do something with gortash's placement in the story in act 3 since he seems to be a lesser threat to the story vs orin.
he is not much of a threat vs what orin brings to the story and more so in a fight.
ketheric thorm has a far greater presents as a villian in act 2 and a better boss fight.
if i was to guess gortash should've been the boss for upper city if it was in the game and orin would be the lower city boss but i dunno really.