Hunter was a weak link. I am sure Q and NSA new it. Remember all the ankle cast? Maybe our guys picked up Hunter at that time and showed him some evidence on him. And offered him a way out since they needed a cool way to bring all the sick shit into the public domain.
I do not think this clown went out our guys on his own at first. His text to his dad that his only chance at redemtion was if his dad ran for President. Well probably the deal with our guys depended on his dad running. So that this October would be perfect destruction.
I think Hunter was between a rock and a hard place and decided to throw in with our guys.