I think it's really up to the individual CM whether or not they desire to move to a different position. For instance, I have seen the same CMs several years in a row in the same position (like Rich, who has worked as a FL ride operator for decades now, and the other Rich CM who works security at the rope drop). I look forward to seeing these guys each time I'm in DLR.
Do you remember the CM's names and where they worked?