While technically true, that the COACH cannot give a commitment, the coach will work with the Admissions Committee to issue an LOA, which IS a commitment, pending only securing a Nom (assuming medically qualified). A nom is almost a virtual certainly with an LOA in hand, so an LOA is a de facto Appointment.There is not a commitment period. A coach can give an athlete three different levels of support. The highest level being the "blue chip". Given that you still need the nomination and the final Appointment - no true commitment is extended by either side.