Hi. I'm here to make a prediction on where the Hokages will go. I think the the first 3 Hokages will track down the current 5 and Hashirama will heal them (Tsunade first if course). Oro will tell Hashirama that Tsunade was ripped in half and try and find her. While that's going on Minato will go onto the battlefield and reunite will Naruto. And Oro knows this because he absorbed Kabuto's knowledge and I'm assuming Kabuto's knew about the Madara vs 5 Kage fight. This is my first user submitted theory, so be nice.