Relationship with John
It is not known for certain what Terry's relationship is with John Seed, but John states in his letter that 'You know, I do things I don't want to do. The things I should do, I don't do. Everyone's human, and that's why I don't want to put myself on a pedestal. I don't ever want to get back up there again.' This could be taken to imply that John has told Terry his dark past, as stated in "The Book of Joseph". This could mean that John and Terry have a close relationship, if John trusted them enough to tell them about what he did in his past.