This line then!

I understand... That's why for Hakurei Shrine it is Reimu-san instead of Aya-san. (A)

But the ace, Reimu-san, also being the puller is...

That's because those five have troubles with complete division of their roles.

Moreover, "ace" doesn't mean "stage favorite", you know.

I'd even say, what the most expected of the ace is...