Indeed.
Bolton is a mixed bag. He has baggage but he is also so off-the-charts happy over Trump knocking General Butcher off that he is likely to give Trump a big wet kiss the next time he sees him.
Bolton wants to return to a conservative think tank and the fox news type circuit. He may diss trump to counterpunch him a bit for firing him but it is not to his long term advantage to become a key player in bringing Trump down. That will not work for him in the circles where he travels and wants to continue to travel. And even if that is not correct, and to your point, anyone attempting to use him needs be aware that he is unpredictable. People assume he is pissed and he is, but he thinks that Trump is not tough enough on lefties and terrorists so a good part of his psyche does not want them using him.