Mysta definitely had issues with management, including things falling through for odd reasons (like his planned appearance on Trash Taste). What he never did is just do it anyways without permission. He also has been and almost definitely still is friends with Vox and Ike past his graduation, which is why I think their involvement might be more benign than people (and they themselves with that statement) make it seem.
Only loosely related but an issue I had with the public's response around the Nijis is that we assume graduates are probably innocent concerning Doki, and we also assume that Niji has, and had since before the termination day, a long list of upcoming graduations. Yet everyone still in Niji is a suspect/complicit with Doki happenings within public perception (save for 2 or 3 people), all because of a single retweet. Lots of people catching slack they wouldn't have, had they had a higher place in the queue.