According to Q's latest post, Whitaker is in a position to lose his career over exposing RR, independent of the timing of Mueller's report.

Barr's tenure at AG cannot be clouded by this BS with RR and Mueller. He needs a clean slate to move the DOJ and FBI forward.

Whitaker was selected a year ago specifically for this purpose by Sessions. THIS is what and why Sessions was to be TRUSTED. Whitaker can take the heat. He wanted it. He's unafraid. Fearless. The quintessential Punisher.