Dont forget Sarah Hall Ingram. She was Commissioner of TEGE during the corruption. I notice the House Oversight skipped her going down the chain of command in calling witnesses.
She is the one the White House wants to protect. She is now in charge of Obamacare at the IRS.
Maybe Ingram is being isolated. they might be waiting for someone to point the finger at her. People in the IRS may be asking themselves, 'Why does she get a pass?'.