Just lift your ass off at whatever time of day you feel best; you'll grow. Sweating these miniscule details is over analysis. If 99.98% of your routine is in order (i.e. training, sleep, diet, supplementation) then when you train is going to make negligible difference.
However, Chocolatemilk did make the good point that Test, and several other hormones, peak in their circadian rhythms shortly before we awake. But I've never seen any data that this fluctuation is enough to actually effect any benefit. So, if somebody wants to run that experiment for the sake of science, go for it!
The additional fat-loss of morning fasted cardio is, IMO, probably due primarily to being in a fasted state, but you never know.