The “unexplained” are so sparse they can be hard to find manually. I just now posted a script at Find missing Spouse Of relationships to find the “unexplained”. So far I have only tried it on my database. I would love to see additional testing of my script. It might (or might not!) find some “unexplained” in your database that you have not found manually.
It appears to me that my own script to color code based on relationships will need only the tiniest of tweaks. The tweak will need to be in the first step where it is color coding relationships before color coding spouses of relatives and parents of spouses of relatives and siblings of spouses of relatives - that sort of thing. In that first step, it will need to ignore anybody whose PersonID.Flags field is non-zero. With that one small tweak, the rest of my script will work just fine.