Originally Posted by
Florena
Yeah. Wolfheart and his leader short story had him getting over the 'bi-polar' thing from having two halves fused into one again. And Tides of War showed the result of this as well. Then come 5.1 and he flat out tells Anduin it's a war about 'love of what's right' rather than vengeance against the Horde. So it's clearly established Varian has no interest in getting revenge out of spite. So I honestly don't see him leaving Org after killing Garrosh as neccisarily ooc, though we'll need to see how things actually go down in the raid.
Even in Wrath he at least had clearly established reasons to hate the orcs. Being a gladiator slave, them destroying his kingdom/killing his father, the death of Lothar, etc, where as Garrosh we never learn his reason of 'the orcs are suffering in the desert while alliance have good land' until Heart of War, and even then you could argue his words in Wrath seem to go beyond that justification.