Interesting, maybe he’s annoyed with Comey and gang for blowing the cover on how deeply rotten the agency truly is.
RR? or AM? Certainly it seems to be emerging that McCabe was at the center of the whirlwind, everything seems to refer back to him (Strzok, Comey, Ohr, Baker... FISA, [187] HRC investigation, suppress Weiner laptop), although it is highly unlikely that he was the 'boss'; that would probably have to rise as high as LL, and quite likely higher. You called it: the whole top structure was rotten.
Q seems to be saying that the fat lady (LL) is singing; buckle up! ;^) LL is the wheel in this machine that can roll over them all, including Brennan, Rice and the 'bamster, and leave a smear sticking to the road.