Well, I may be wrong, but if I were to guess, I would say that Super wasn't actually planned before the new movies started getting released. I'm sure there was an idea in place, a sort of 'if these movies are successful, there will definitely be a series', but had the movies not done the business they did, they're probably wouldn't be a Super. I think it makes sense when you think of it that way, and them wanting to have all the new canon and characters in one place as opposed to having arrows pointing to here and there to figure out who is what, how this happened, and why this is like that.