What I always thought was weird was that, in spite of the fact that Kurdt Vanderhoof was always the primary songwriter and leader of the band, he didn’t appear with Mike as an official member of Metal Church until XI.
The story goes that MC was his baby, but he hated touring. So after David Wayne left, Kurdt pulled a “Jon Olivia” (Savatage) and stayed on as a primary writer in the studio, but not being a listed member of the band. Obviously, he stepped back in later.