As always, thank you for the helpful insights. And, I am so glad I was able to help someone else, but I am really sad that others have experienced similar issues!
I have a new development which could be good news. I learned from a neighbor who sympathizes with my situation that the owner, a military member, has received new orders and will be selling almost immediately.
I believe I need to find a way to be sure that the listing agent is aware as I do believe they will attempt to not disclose. (Simply basing this on the number of lies they have told me and others).
I have notified the mediator to solicit his input and reaching out to others to see what can be done to resolve all of this fairly for me, them and the new owners. I backed up again this week, so pretty sure the supposed fix was not an actual fix.
I am so grateful they are leaving. They are the real reason I wanted to sell my house last year. I hope I never make a neighbor feel that way.