When it comes to Mark's mood changes, don't forget that he intended to release OES in 1990 and had a tour planned just one year earlier than it eventually started. It was all delayed due to the tension building up in former Yugoslavia, which resulted in the war there.
So he took this opportunity (time) to re-record some of the tracks.
I think Ed has already mentioned on the forum several times, the OES tour was postponed because of the first Gulf War, after Iraq invaded Kuwait.
There was an issue with insurance etc. It had zero to do with Yugoslavia and nothing to do with Mark or individual band members, it was just too difficult logistically to start the tour with a war in the middle east going on.
As far as I knew, the album was finished and mixed before the tour was postponed. I had auditioned for Mark and John while they were mixing the album. The tour was postponed by six months. The delay actually impacted some people hard, much harder than it impacted Mark.
People had made themselves available to tour in early 1991, had turned down significant other work, like other world tours, then we were all told at the last minute the OES tour wouldn't happen for at least six months.