If a position coach has two opportunities (one being in GB) that might have a bearing on his decision, especially since GB seems to deny permission frequently. It's also worth considering any possible impact on the morale of your employees. 1. You have a coach who feels he was denied a promotion - is he going to be as effective? 2. Other coaches will know he was denied the promotion - how do they feel about their organization? There are good reasons why this kind of permission to interview (for a promotion) is rarely denied, which is not to say that there aren't valid exceptions to the rule.
Not yet, but he has been granted permission to interview, once that happens he can go if he wants.
Only to Head Coach, for anything other than that the coach needs permission to interview, which is usually granted for a promotion, but not always.