If you cannot find an earlier ADR, you need to decide what is more important. Dining during the first hour the park is opened, or touring. I am not at all sure the CM will let you through because that is an avalanche waiting to happen. If that was commonplace, you would have read about it here, and I have never seen one report that CM's have a "grace" period for entering the park for 9 am ADR's. Can it happen? Sure. But I would not bet my first hour on that.