2024 Women's Soccer Joyner brought Chris King to Davis, and, I think, had worked with him when both were assistant coaches.
It's frustrating to have a departing coach take players and assistants with them when they leave. On the other hand I understand wanting to have "your people" with you when you take on a new head position. You know what to expect from them.
And as an assistant, you have no guarantee that the incoming coach will keep you on. Gotta put food on the table and keep a roof over your head.