[Samba] Courses of action I can take:

[Zombie Ryushu]

If I know what files in Samba's private folder I can delete and remove 
the join using one of my other DC, I don't know if I can delete the 
entire folder.

How do I switch the DC from MIT to Heimdal?

Modifying DNS is off the table for right now, because it could cripple 
my entire network's Name resolution.

The file server issue deals with the relative smallness of my network. I 
don't keep all DCs or all servers active at one time. Only one server 
runs constantly.