“Bill Preistap, Strzok’s boss, is singing like a canary”
Keep in mind that this is guesswork at this point, based largely on Priestap being The Invisible Man despite his being the link between McCabe above him and Strzok below him.
He almost never gets mentioned which makes him conspicuous by his absence. Even Comey simply alluded to him by his title rather than his name. It’s probably a good bet that he is talking but it’s not the sure thing that the article leads you to believe.
https://twitter.com/ThomasWictor/status/963264232736239616
The link is to Thomas Wictor’s twitter feed. There were a couple of texts from August 2016 that Page and Strzok knew somebody had flipped back then. Wictor seems to think it’s a name with four letters. If it was “Bill”, they might have all just decided to make him the fall guy.