Guess it depends on what you do as a consultant. Maybe can't coach college kids well, but maybe he can spot flaws in defense and communicate that to the coaches who can translate it into something the players can learn from. The partner I started work with as an associate and worked with for 25 year, all the way through my retirement, was a crummy teacher but a brillant attorney. If you had the skills to observe and learn that way, you learned a lot. If you were relying on him to teach you, you pretty quickly failed. So I guess it depends on the scope of his role.