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Kson had planned to join VShojo much earlier, probably even before the new year. But, part of what she had wanted was that Kanata would go with her. Kanata with both agape coming out and probably just liking all the stuff she has with Hololive more than whatever Vshojo is offering, didn't want to leave. Kson maybe made hints to VShojo that Kanata was gonna come along, so they made a similar-ish model for her but PPTenshi didn't budge. This is when Kson starts disliking the idea of corporations being able to keep the characters of others, and is indecisive over going to VShojo if she's the only one.
February comes and goes, and with everything that happens then Kson comes back around to joining VShojo because she wants to save MiguelGatto and the entire situation affirms her belief. With the announcement that those two were joingin VShojo, Cover had a meeting with Kanata where they expressed concerns over her living with someone who now has more animosity towards them then when she left, and potentially having someone who blew up and leaked confidential shit hanging often to. Kanata understands that, and maybe the implication that she wouldn't be clued into to bigger company-wide things, sponsorships and the like, makes the choice to move out. Kson thinks it's Cover forcing her while Kanata is still adamant that it was her own decision.
>tldr; Kson failed to convince Kanata to jump ship with her, has Rushia fill her spot, Blames Cover for it