BE is indeed about character collection, and it does do the 1-6 (well, 7 now) Star upgrading thingIs BE all about character collection? One thing I liked about Mobius is that it felt refreshing from other mobile games because you collected classes and there wasn't the whole (1 - 6 Star upgrading system).
In Dissidia you get the characters from the story, but the gatcha element is for weapons and armor (which also have the upgrading thing, and some of them give your characters limit breaks basically)