No offense to the guys that have been on property for a long time, but it seems fair to say HR rules this new era of interviewing at United. An outfit like Cage with very connected consultants to the interview team at UAL know this and don’t just over train you. The consulting is not about being fake or pretending to be someone you are not. It’s to highlight your personality and experience all while preparing you for the format of the interview questions. If you have some quirks or mannerisms that are less than desiresble for a preofssional airline interview, they’ll find them and work to improve those issues/weaknesses. By no means are these consultants training you in anyways to misrepresent yourself.
But it’s your career... if you think you’ll be able to go in and ace it with only having your significant other critiquing your interview skills then good on ya!