Maybe your experience of interviews is different than mine. The purpose of the interview is to sell that you are the right person for this specific job. That means you study the job, the environment, and plan how to succeed in that particular environment. I would think a coach would study film of the offense and defense of the team he is interviewing for and be ready with customized answers about what needs to be done at that organization. Maybe he can just go in and give the same answers to each team, but unless they’ve already made their minds up that usually won’t cut it.