Mueller thought he could outrun all of Comey and Brennan's misconduct by being aggressive against Trump, but he couldn't last any longer and had to close up shop. This is why Comey and Brennan are now more vocal than ever. Their interference (Mueller) is gone. Their great hope of Trump being charged is gone. The House impeaching Trump looks fanciful. Thus, Comey and Brennan are now louder than ever; they are seeking to control the narrative in the press. It is now their narrative versus the OiG's and Barr's narrative.
I'm putting my money on Barr.