Meanmistreator
Granada Porch Crew
He wasn't on the Walk On album (1994). I forget who sang on that one. A Brad Delp sound-alike (pretty close).
Even though he didn't sing on Walk On, he actually wrote or co-wrote some of the tracks. I believe the title track was one. Both Brad and Fran were on the last album.
PS. Boston used three vocalist to produce vox that sounded like Brad for the Walk On album.