>>4612051 (lb)
You're retreading (incompletely) old ground.
Bill Priestap transferred to the DC Office from SDNY in Dec 2015 - and wouldn't be trusted by the key members of Spygate. It's already well known, covered and dug that Strzok was reporting directly to McCabe.
Priestap knew 'some' of what was going on, yes - that which couldn't be hidden, ie: that which had to be documented.
but he wasn't directly involved in more than structure and what they couldn't route around him.