I thiiiiiiink John is very secretive; showed up one day to what would become the Lundegaard group and was like "Hi. :)" I don't think he would NEVER tell Gideon personal details about his past but I think for the time being he's been focused on survival + the community, and maybe was juuuuust starting to open up about himself when the murders happened. So now he's like "Back to work :|"

John will have fun in the afterlife, Gideon. 😇