I do want to mention that the Twins have a mystery collab tomorrow and it might be Gura. If we presume the theory that Cecilia was just the first girl to ask for a collab, or ask for a collab during a good time for Gura... then I'm 100% the Twins had a message in Gura's inbox within the hour.
They're shrewd and openly ambitious. If anybody in Advent is going to force a Gura collab, it is the Twins.
Also, there is a non-zero chance we will see the Nerissa-Gura stream relatively soon. Nerissa seems capable of reaching out if the scenario is "you have to ask," and that looks to be the case with Gura. Also, I remember that she and Gura got along fine in EnReco, and the few times Gura brings up someone in Advent, it seems she's openly pretty fond of Nerissa. I may wrong there, but those are the vibes I got.