Looks like Karl Groom has shed some light on Damian's departure...
Link: https://www.progradar.org/index.php/2017/09/28/interview-with-karl-groom-of-threshold-by-progradar/Q: Glynn Morgan has returned and replaced Damian Wilson on vocals, any particular reason why?
Karl: I can tell you what happened, we never wanted to make a statement because we’re not in the business of trying to put Damian down or anything, he’s a really valued member of the band and he did a fantastically good job. However, in October, after we’d played Prog Power Europe I was giving him a lift home to Oxford and he said to me “what sort of singer do you think would replace me?”, I didn’t really pay much attention and he gave me a few names and we left it at that and I said good night.
A couple of weeks later he turned up when I was working on something in the studio and said that he’d decided to leave the band and it was then that I realised that I’d missed that, I’d missed him telling me that he was leaving the band completely! He gave me names of these people that he thought might replace him and I never want to be in the position of chasing people to be in the band. As I’ve said, I feel privileged to be able to play music to the people who want to listen to it and I wouldn’t want to put him in a position where we’re chasing him.
Threshold is something that’s special to me and if he’d come to the point where he felt he’d got other things to do or you don’t want to be in the band then that’s great, he’s done a brilliant job and we’ll move on. When I spoke to Richard later, I said to him that Damian had decided he was moving on and I don’t really want to take on one of these people he’s suggested, what do you think if we ask Glynn again?
I know he wanted to rejoin the last time Damian had come back. He’d found out afterwards that Mac had left and he was interested but it was too late then. In 2008/2009 we did some work with him on our ‘Paradox’ singles boxset on a couple of the tracks and it was great. I’d always loved Glynn’s voice and the three singers we’ve had are the singers I’ve wanted so if Damian leaves and, unfortunately, Mac is no longer available, it would be brilliant if Glynn came back.
Richard had been in contact with him not long before that and when we spoke to him he was over the moon and, as he said in his statement, he really wanted to get involved again. I thought that his enthusiasm was something you just can’t turn down. As the story goes, Damian changed his mind a few weeks later and wanted to come back to the band. I never really got a satisfactory answer as to why he wanted to leave or come back, he rang Richard this time and said he wanted to come back.
He actually did come back to start recording the new album but he didn’t finish it and we didn’t have any dates from him to come back. We did a show in Switzerland and the atmosphere in the band was just different, we knew he’d wanted to go and then he sort of came back but didn’t want to do certain dates that we’d tried to book to finish the album, he wasn’t available for those. It just seemed like we were in competition with something else and I said to Richard we would have to find someone who wanted to do what the four of us wanted to do, the rest of the band.
We want to do things, we don’t want to be inactive, we’re not that young that we can be sitting around for years doing nothing. We told Damian we’d have to move on and I don’t know if he wanted to leave or not or whether he didn’t like the idea of looking bad on social media. I’m not sure whether he really wanted to come back or not, I don’t know what it was but it wasn’t really a good fit once he’d decided he wanted to leave and we just thought that, even though we don’t want to fall out with Damian we need to move on.
He still wants to meet up and chat again, we’re not on bad terms. I don’t know if he was expecting it or not but we said, in the light of what had happened, we’re going to move on and we’re going to find someone who wants to be in the band all the time and it worked out, it fits Glynn perfectly, with the extra power he has, on this new album and it works well.