Alright, so I have a long shot theory on the outcome of this fight/ end of the war. Kabuto is going to not die after the edo tensei is deactivated. He will slither away undetected and become the next main antagonist after tobi is killed. I believe kabuto is stronger than any individual character alive in naruto currently. He can fight on par/ winning against 2 genius uchiha in their prime, and through knowledge, research and jutsu perfection can wipe out thousands of joint shinobi soldiers and keep the 5 kages at bay.
I believe i have also figured out how kabuto reaches and maintains sage mode while moving; its simple, just like jariya fused with ma &pa kabuto has a sage snake attached to his body at all times.