“Olive branch” = immunity
Even if they had enough on him right now, I wouldn’t offer immunity to him because he doesn’t seem to have the character who would be helpful - and now from a practical side, he would never spill the beans on the Clintons, et al... seeing what happened to Epstein, in the “protective care” of the federal government, was a warning to others.
DOJ FBI “investigation” is little more than cover up to protect their pedo selves and their pedo masters. I guess the UK outside of their legal pervue creates an issue for them they can’t control someone outside of US law.