Brennan was head of the CIA, anyone that does not believe he has a get out of jail free card is fooling themselves. At worst Brennan gets a slap on the wrist for some process crime, loses his clearance and never works in government again. Comey and McCabe could be up sheetz creek however. McCabe is fighting for his retirement and Comey could lose his. Lisa Page has been singing in my humble opinion. So her former lover may find himself and his arrogant a$$ in the worst trouble of anyone. Some low level FBI and DOJ folks will be outed as leakers and terminated, probably not charged unless leaks included classified documents. Obama will look like a poor executive/manager and not much else. Comey and McCabe will be the fall guys, loss of retirement, conviction on a process crime, loss of clearance so no more working for the Feds.
All of the above fear a Special Prosecutor more then Horowitz. Special Prosecutor would be working outside the DOJ where they still have friends and can influence people. Special Prosecutor would be someone of Trumps liking this time and that does not bode well for anyone not fully cooperating.
Why would he not, considering the overwhelming evidence, and especially now that the Congressional Democrats have made such a display of revealing to him exactly what they are?