I personally didn't see anything wrong with the movie fight though. Unless the series is going to be more than 100 episodes, I personally don't see how 15ish episodes of retelling is going to be of a benefit.
to be fair that original 100 ep rumor was just the original order. You can always add on more episodes and as long as everyone is still free to they likely will as the ratings are holding steady for a 4-5th place anime finish for the series nearly double the ratings of the 10th place finishers.
I mean we are opening up multiple universes, that sets up a lot of potential new bad guys that can be conveniently stronger than the last without people ever hearing of them before.