The theory about fasted morning workouts may or may not work for you. I personally wouldn't do it because I believe that its too catabolic. The body's choice for what fuel to use is mostly driven by the demands placed on it. In the situation where glycogen stores are high (or normal) and the demand for immediate pre-oxidized fuel exists, glycogen will be used. If the demand is lower and the body has time it will make the effort to bring tri-g's out of storage. Thus you can (and do) burn fat even when glycogen is normal or higher. Now if glycogen is deleted and you place too high a demand for fast energy the body will start breaking down lean tissue (muscle) to meet the demand (glucogenesis) since oxidizing fat for fuel is a slower process. So if I were to do fasted morning workouts I'd definitely keep to low intensity cardio but I'd prefer to avoid it altogether.