On your flash drive, in config/shares, there should be a .cfg file named for each user share, such as appdata.cfg. If you want to get rid of those files that aren't used anymore, you can just delete them and only keep the .cfg files that correspond to the user shares you currently have as shown in that screenshot. It would make your diagnostics somewhat less trouble to wade through.
I've never run my dockers from an Unassigned Device so I'm not entirely sure how that works. I assume you would want the UD to automount but I don't know if there is something else needed to make sure the docker service doesn't start until after that mount. Maybe someone else can chime in here.