Maybe with more context I'd have enough information to agree with you, but with the info I actually have, I can't say it wasn't their job to play devil's advoca

Maybe with more context I'd have enough information to agree with you, but with the info I actually have, I can't say it wasn't their job to play devil's advocate. Maybe they had good reason to be skeptical of the direction things were going and needed to ask enough questions to be sure it was right in order to best represent the concerns related to their role on the team.