No, Scott was technically not even bridge crew. As head of engineering if things are going poorly Scott’s not going to be on the bridge. Thus not high in the command structure. Kind of like McCoy, regardless of his rank McCoy will never sit the chair because if thing are that bad he’s got better things to do.
There were episodes where he was put in command!
In Bread and Circuses, Scotty was in command and on the bridge.