The possibility of another villain was brought up a few episodes ago, looks like there really were other people who aren't with Myne and is also against Nao and company.
Any scene with Motoyasu in it is always irritating, even if he ends up joining Nao after this I don't think he'll change and become smarter in a span of a few episodes
Also, why is everyone suddenly all about "let's kill these 4 idiots and summon another group"? Fitoria wants to kill them, this pope wants to kill them, the wave wants to kill them!
I'm not convinced Malty's being used by the church, she's been acting out of her own self interest all this time, I'm sure Malty will find a way to control the church before the end of this series, it's in the OP after all