MechaPilot
Explorer
She is what drove him over the edge to where he makes the pact.
He drove himself to the edge. She just refused to love a monster.
Anything outside of that is just change for the sake of change.
Change is almost never just for the sake of change. Presumably, the authors had reasons for the changes they made. Without being able to read their minds, we are in the dark as to those reasons, but that doesn't mean they don't exist.