It would be interesting to learn who his superiors were, during each detail assignment.
There should be some directives, about his proper role.
What were his orders? Who issued them?
If Brennan was ever his "superior," then you can count on Brennan being that superior ever after, even after leaving his employ. It will come to pass everybody will come to know this entire BS Ukraine fiasco was Brennan's doing. A lot was his workcraft, including the entire Steel "dossier" hoax. Brenna had the connections in UK and Ukraine to bring all the characters together.
I'll be happy to see that fat bastard dangling from the nearest lamp post. He's #1 on my Hit Parade of Brennan, Comey, McCabe and Strozk.