Look, I see where it all matches up but Disney would never do that to hiro. Imagine the emotional trauma he would go through. I do believe their will be a sequel to big hero 6 though. I believe Yama, from the opening scene of big hero 6. Where hiro is at the bot fight will be our star villain this time. As we saw in big hiro six revenge can do some terrible things and Yama is pretty smart with robotics as well. Plus even if todashi is still alive to make it big hero 7 he would never ever be a villain and he would have came back to hiro as soon as he could.