Last Minute Change Robert Mueller Demands Aaron Zebley to Be at Hearing Tomorrow Like a Defense Attorney?

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Why does Robert Mueller need his longtime associate Aaron Zebley to be at the hearing with him tomorrow, after all, if Mueller plans to not stray from what’s written in his report, he wouldn’t need advice, but clearly Mueller feels he’ll be asked about ObamaGate (the conspiracy to clear Hillary and frame Trump), why he (Mueller) didn’t pursue that angle of Russia’s meddling (by the Golden Shower Dossier supplied by two of Putin’s top disinformation specialists), and so Zebley will serve as the equivalent of a defense attorney apparently, to tell Mueller what he should and should not answer, without pleading the Fifth which would raise some eyebrows if he did wouldn’t it?