I did have another thought on this as well. If weed blocks gaba but raises dopamine, and dopamine raises human growth hormone, then maybe this is why after workout is better as well, like you said, more for repair usage, but then again most studies i've read seem to say that weed decreases human growth hormone so i'm not positive on that one but it may make some sense possibly depending on if human growth hormone is already elevated from the workout. It may give a boost to an already working system instead of a stagnant one.