He likes to play devil's advocate during our team meetings.
devil's advocate
idiomOne who debates from a viewpoint which one may not actually hold, usually to determine its validity or simply for the sake of argument.
Origin
disputed originCalque of Latin advocātus diabolī (“the devil’s advocate”), a popular title given to the officer dealing with the canonization process in the 16th c.
She played devil's advocate to help the group find potential flaws in the new project plan.
Although he personally agreed with the proposal, he played devil's advocate to ensure the committee considered every possible counterargument before making a final decision.