Great answer IMO. While HIIT is effective when low carbing it, AND going hypocaloric to boot you want every damn bit of glycogen you can spare in reserve for the resistance training, trying to keep gym performance up as high as possible.
With the AD however, though my knowledge on it is not anywhere near that of many others here. Doesnt it allow carb ups tobe adjusted to fit ones goals. to fit the individual?? If so add in amn extra small carb up for the HIIT day or reserve it like stated for sat AM and carb up and rest the other time during the weekend.