Also I'd just like to point out, that nothing says Caliborn's growth is permanently stunted. It's possible, in fact inevitable... that he will still interact with his sister in the future and whatnot. I don't believe in permanent stunting. I believe stunting just means you paused on your growth, and you could continue at any time. Even in human biology, this is the case. It's why some people can end up growing later than others, etc.
I had already said I'm done arguing with you, and I'm not even going to begin to bother trying to dissect everything else you've sent to me, but this is something that's EASILY debunked just by reading the comic. Take this passage from a conversation between Andrew and Caliborn.
You may be destined for bigger things, but you're still an atrocious, stupid child. And you may have won the "game" with your sister, but that doesn't mean it was the best thing for your development as a person. You had her dream self killed, which is not an opportunity your species typically gets. So she died prematurely, instead of allowing the conflict within you to settle itself naturally. In short, you forced your predomination to happen a little too early, and now you're stuck. STUCK? Yes. Your personality is stuck in some sort of cantankerous prepubescent limbo. You are going to be a stunted, miserable tool forever.
Also, consider this passage from the Wikipedia page on stunted growth.
Once established, stunting and its effects typically become permanent. Stunted children may never regain the height lost as a result of stunting, and most children will never gain the corresponding body weight.
So yes, is growth IS permanently stunted, and there are plenty of indications of that, including the actual definition of being stunted. He prematurely aborted what was a very important part of his physical and mental development, and so he'll never properly develop. Which, again, is an apt scenario to depict in a tale about growing up. Who better to make the villain than a character who not only refuses to grow up, but can't because of his own choices and actions? Not to say that they were well-informed choices, but he still made them, and he has no intention or desire to go back. And given all we know about his character, he almost definitely never will.