Well as with all great storys if you know the future you try to prevent it. While trying to prevent that certain outcome you end up being the one responsible for it. Take god of war 3 it said kratos would destoy olympus, So zeus tryed to have him killed which in turn made Kratos go after him and ended up destorying Olympus. So it could be that allso in a fight with the furries Kratos lost his memmory or it was his bloodlust either way the event was bound to happen hope this helps.
It might be a limited use type thing or it might be that a mortal cannot have future knowlege on a God. I'm sure they will explain it and not make long-time fans scratch their heads with more questions than answers.
Also your English is fine, I don't see why people want to take issues with proper grammer and minor problems on a forum.