My 654 partition busy error when using 2 edir-edir drivers in the same tree
has been resolved.

I am now wondering if it might be worthwhile to investigate going back to
1-driver and having a MoveProxy driver in the other tree responsible for
creating,modify, etc. the user?

I have never touched the MoveProxy driver. Something like this feasible
before I dig in? Or should I stick with my 2-driver approach. Thanks.