They way I'm seeing this now:
Nadeshiko has feelings for Kotooka, but doesn't act on them because she believes Kotooka is heterosexual.
Tsukasa has feelings for Nadeshiko, but doesn't act on them because she knows that Nadeshiko likes Kotooka.
Kotooka is slowly growing feelings for Tsukasa, but doesn't act on them because she wants everyone to remain friends.
Knowing nothing about the raws: I suspect we may soon get a chapter (or chapters) about Nadeshiko's perspective. Incidentally enough: I think she's becoming aware of Kotooka's feelings.
The only one who may continue to stay out of most of the loop is Tsukasa, but Subaru will fill her in, no doubt.