naw im guessing that she regains her memory and is all happy with gatts and gang then gets super pissed at griffith because she begins to remember that stuff.
so they get powered up by some means and they quest off to finally defeat Griffith.
upon arrival griffith pretty much owns everything and when they confront him they have to beat up all the main bad dudes per say.
Everything is going in Gatts favor and that pisses Griffith off so he rages into Femto.
Gatts has a seal on his neck so he can actually fight Femto. Gatts rages and rages and ends up finally killing him.
alls happy for a few moments till god hand shows up and admits it was all a ploy and Femtos death allows Gatts to change with his armor into Skull Knight 2.0.
the gang is freaking out and getting injured. Skull knight and zodd are there and both of them are going "HOLY SHIT"