I think the myth of cardio in the adonis principles should be taken out
if it didn't work would people waste their time doing it?
would I?
would professionals?
just because some people are lazy and don't want to do it doesn't mean that it doesn't work 
Professionals must be taken out of the picture. I said that numerous times. I have no idea how taking the substances they take affect the principles.
Again, I don't claim that cardio is useless for burning calories. The principles also don't say that cardio is forbidden. If people have an easier time dieting down by eating more and doing 1h of cardio a day, that's fine. I just don't think it makes a significant difference for the purpose of maintaning as much muscle as possible at a certain rate of weight loss, as long as P1-P5 are met. I admit that I'm lazy, but that's not the reason for skipping cardio. The reason is, that in my case, without cardio actually works better.
Your case seems to be pretty similar to that of bigpanda. You said that you can eat twice as much when on 1h cardio per day. If this is true, it's probably easier for you to do cardio and eat more. However, to prove that cardio makes a significant difference, you would still have to do the following:
- perform a complete cutting diet (e.g. from 15% to 7%) meeting P1-P5 but with cardio,
- perform a complete cutting diet (e.g. from 15% to 7%) meeting P1-P5 without cardio.
Then you would have to compare the ratio of fat loss vs. muscle loss on both diets. I did that and in my case, not only was there no significant difference, but without cardio works even better.
I should also again repeat that I have one day in the week where I do not restrict my calories. That's maybe why I can still keep my calories at a resonable level during the week. If the loading days are really necessary however, I don't know, I've never tried to skip them completely.