I so hope we will not see their battle in every little detail. It really should be over after two more pages.
As much as it might be totally badass and probably what the fans want, we know how it ended or?
It's so time that all the slight little hints that have been given, will turn into something solid. We know something has happened with Izuna so why not finally revealing how it all got to the battle?
It must really be something overdramatic since in every other flashback, things progressed quickly. There always was a main point. In this case, even the flashbacks only slowly move towards the truth. Makes me crazy.