Is it possible that the Final Shape is the Witness' end? I think it would make sense when it comes to the Sword Logic. Is it possible that the conquest of the Witness is just a search for someone strong enough and brave enough to challenge him and kill him? Kind of like the Ebony Warrior from Skyrim. Maybe spending eons as a immortal in a mortal realm has made the Witness suicidal and he just wants it to end. Edit: Maybe that's why the Witness holds such a grudge against the Traveler. The Witness knows that the Traveler can defeat him but just refuses to land the killing blow.