I've worked in various consulting roles, and one thing that's always been true is the "rank and file" don't like you and think they know better, can do better,

I've worked in various consulting roles, and one thing that's always been true is the "rank and file" don't like you and think they know better, can do better, and already know or have thought of everything you do. They miss that you're hired by leadrship, for other reasons (see my other post in the thread). I'd actually be worried (and it's happened) when the line employees like you as an external consultant and think you're adding value. It means you're engaging at the wrong level and probably not getting at the root of what you're there to address.