Jim, I understand your point of view. However, one must understand the word replace if used as unusable has true meaning.
That's why we must find a way to get all to understand the meaning of replace. I feel if there are two boxes on the certificate, then it could be very clear as to what a race is doing. They may be replacing a race certified that is perfectly a good course or they may be replacing a course that's unusable. Hence, we need to add unusable to the certificate in my view.