1. Glenn was known by several nicknames over the years. He was a nickname kind of guy.
2. There have been occasions where credits listed on his Eagles and solo albums used people’s nicknames, like an inside joke.
3. It would be unusual, I would think, to have Don and Randy add backing vocals to someone else’s song without Glenn.
Of course, I could be wrong. The credit for backing vocals actually goes to the “Frontline Gardenia Choir”, made up of the 5 individuals I listed in my previous post.