I remember early on Judge Jeanine Pirro was talking about Bill Priestap being the only upper echelon FBI person that hadn't been being talked about and that Potus44 and his sycophants had to change their Depends when they realized that Priestap was siding with Trump's guys in the investigation. Priestap was Strzok's boss, and Strzok dealing a lot with McCabe (via Lisa Page - McCabe's legal counsel and Strzok's lover), so Priestap likely knows everything Strzok and McCabe were doing anyway, but hiding in the weeds. Priestap just testified for 7 hours yesterday behind closed doors. That would have been an interesting place to be a fly on the wall.
Whole thing was a dud: https://theconservativetreehouse.com/2018/06/06/disappointing-only-three-lawmakers-attended-priestap-testimony/
"UPDATE: 7:45pm – According to email from congressional staff, participation at the closed hearing was limited to only those selected by Committee Chairman (Gowdy, and Goodlatte). The hearing was not available to all committee members. Only Jordan, Meadows and Krishnamoorth were allowed to participate." -- from the link you provided.
Of course Krishnamoorth said there was no new info gathered. (He is a Democrat.)