Liokault--you're making absolutely no sense.
Wushu is an MA of form ie, how pretty you can make something look. That's it. It's not about fighting. As such, it has no place in this discussion. That's a straw man you're setting up so you can knock it over. Unfortunately, the discussion is about an art for fighting, so even though the straw man is tipped over, you're still back at square one. My friend Ant will never look pretty doing forms, but he'll beat your ass on the inside.
Sumo is a sport without a weight class. Read my Tua and De La Hoya example until it makes sense.
If the guy doesn't want a sportive MA then he doesn't have to do one. That doesn't mean he can't use whatever art he comes across.
What you are trying to do with the "let him pick something he doesn't have to adjust," argument is ludicrous. You're trying to paint a broad brushstroke as if to say "TKD guys fight on the outside with kicks, so if your short you're screwed." That's absurd. What we're saying is that you choose an art, and you wind up developing a personal way of using it. IE, the shorter guy can win if he learns to close the gap properly and jam his opponent. You seem not to grasp the idea that a fight is a relationship between two fighters, and the one who wins is generally the one that is better at executing his gameplan against the other.
Let me try to hammer in another example:
I have a friend who is shorter than me, stronger than me, very fast and explosive, and less flexible. As such, he wrestles on the outside, looking for quick shots and duck unders and avoids the tie up.
I'm taller, slower of foot, with longer limbs (levers). I have developed better sensitivity than he has and am a better counterwrestler who likes to tie up.
Which one of us isn't "wrestling?" After all, there's some "way" wrestlers fight, right? Since our personal styles and builds are so different it sounds like ONE of us must have "adapted," the style in some way when we would have been better off doing something else.
"In the world of martial arts, respect is often a given. In the real world, it must be earned."
"A stupid man's report of what a clever man says is never accurate because he unconsciously translates what he hears into something he can understand. "--Bertrand Russell
"Liberals - Cosmopolitan critics, men who are the friends of every country save their own. "--Benjamin Disraeli
"A conservative government is an organised hypocrisy."--Benjamin Disraeli