https://www.justice.gov/opa/pr/deputy-attorney-general-rod-rosenstein-announces-edward-o-callaghan-acting-principal
That link, dated Tuesday, April 3, 2018 just states O’Callaghan will serve as the Acting Principal Associate Deputy Attorney General.
Key on the word associate. It has nothing to do with "recusal".
“It has nothing to do with “recusal”
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Correct. Rosenstein will not be in the meeting. O’Callaghan will. Rosenstein has not recused himself from his involvement with Mueller. Both he and Mueller should recuse themselves, and Mueller should shut down Russiagate.