We can't draw conclusions based on how we think it should be, we can only work off of what is. Moreover, we can't expect Smash to take the lead on shifting prominence within a series, Smash is reactive and reflects the hierarchy within the series. ARMS has the opportunity to shift, but that shift will likely stem from ARMS itself. Smash is just a mirror.
To that end, we have to gauge expectations based on how the series operates, not on qualities Smash doesn't value. Min Min and Twintelle might be fan-favourites (though only the former seems to be globally popular, and thus I think the latter is rather unlikely) and are growing within the promotion of the series, but Spring-Man, for all intents and purposes, is still the protagonist until further developments potentially change that, and the importance of that station can't be discounted either, because historically that's quite often what's valued highest for Smash.
Maybe it would be a missed opportunity to not go for another choice, but we have to play with the cards we're dealt. We can't impose our own paradigms onto Smash, as that would, in all likelihood, be fruitless. For better or for worse we have to abide by theirs. And as it stands now, I think, of any individual character, Spring-Man stands in the best stead, though he's not without competition. Though frankly, I think it's only from Min Min.
