that is indeed the kind of theory you would expect from a marshmallow. Simply loved it!
Whai thank you! But really, he was hanging on a pole for a month, no poop. He has been unconscious for days, he gets up aaaand… no poop, and so on. Unlike Luffy we have no proof that he poops. My guess is that, since he have no sense of direction, he can't find the toilet, and therefore with time he trained his body to use everything it gets in so he won't have to poop. Now based on this we can conclude that he have certain powers like talking with the sword in his mouth and other powers a normal pooper doesn't have, because he have another source of power. Though if anything, when he bleeds it's a way for Oda to make up for this. Therefore it's necessary for him to bleed. And so he does. A lot. Remember when he just pushed his organs back in? Well, he doesn't need them.
Poop.