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People keep saying it’s Suisei or Watame or Miko but Occam’s razor says that Kanata was referring to Marine being the person that is hard to work with and unable to put their feelings aside.
We all saw the sharp contrast between how frequently Kanata and Marine used to interact to then basically never talking, even though both of them are in similar friend groups and holo projects (witches). We know that Kanata had flirty interactions with Ao, who Marine then obv got jealous over. Ao then gets fired after Kanata’s decision to quit is made, and then Kanata quits.
I feel like this is all pretty straightforward compared to the schizo Miko secret boyfriend producer who controls everything from the shadows theory