Im lost at this point, where was the last time the "main couple" showed up? Himari and Yori?
I'm not sure if your question is sarcastic given the quotation marks but isn't Aki and Shiho are the real main couple?
The premise of the current arc is to think really good on your future. SSGIRLS is set to go for college and Yori seems to feel like going to college as well than going pro for now. Meanwhile, Shiho is dead set on going pro with Laureley, which seals the deal with the band going viral, scouted by Queen Records, and got offered to perform in Zepp.
One thing is clear that Momoka only want to go pro because it's Kyou's dream and she can't think of anything for herself. It may take a while before we finally get Momoka's POV because we're about to get more of Hajime.
This may or may not be a hot take but I don't think Yori can do of help at the current arc. Maybe if she'll be able to recall what Momoka said earlier during AyaMiki's arc, which will be quoted below, then it may be a tiny bit of help but it's better than nothing.
On her yearning for Kyou, probably
It's okay to hold onto these feelings even if they're not rewarded. What's so wrong about that?
People are free to keep feeling the way they do, aren't they? I don't think I've ever though about giving up on my feelings.
On Hajime
I think she's just being considerate of me. She's probably just making sure I'm not lonely...