My guess is its not a “routine scheduling error” and that, instead, Mueller has some news this week that McCabe being put under oath would distract from and undercut.
Not gonna look good for the Mueller inquisition once his three primary investigative conduits McCabe, Ohr and Srovok start taking the Fifth in front of Congress. Then the cries go out for investigating the investigators and forcing the Dems into the unhappy position of defending witnesses pleading the fifth amendment