Guess what? Nomura Tetsuya's sexual preference has nothing at all to do with this topic, or to do with his ability to create characters. Also, "gay" is not to be used as an insult - unless you mean it to mean "happy", whereas, yes, I do think Nomura is quite gay, because he's known as an amazing artist and storyteller. I do think he is a fantastic character-weaver, though he has stated in interviews that he doesn't really control the characters' personalities much - he gets a few keywords in and otherwise he's just the visual - he certainly gets credited for fantastic characters.
However, on the topic of the Organization's goals... nothing will be confirmed until the game is released. It's speculated and mostly confirmed by COM that they wanted to know the secrets of the heart, much like Ansem did. I doubt they all are looking for the exact same goal - I bet many have different reasons and aims as to why they want to do what they want.
Riku, though. I doubt he would willingly join the Organization. Not because he's a rebel like that, but because they tried to kill him and drag him into darkness. I don't know about you, but if someone came happy-skippity up to me after attempting to destroy me, and asked me to join their club for the heartless shells who still breathe, I would refuse. He might don the coat, but I hardly think he'd cooperate much at all.
It's said that Riku's outlook in KH2 isn't against Sora, but is still from a different perspective. If he isn't light or dark, but a mix of the two, then he most certainly won't be agreeing with Sora on the whole "light > dark" thing, because he himself is a piece of the darkness, and while he evidently values both sides, he knows he can't place too much faith in either.
There's another series I've followed and love dearly, that goes with a lot of light and dark metaphors - anyone who understands "lotis" and "maram" will get the reference, but there's one line in it that strikes me as very plausible in the Kingdom Hearts series - "We should not remove the {darkness}, but softly envelop it. In recognizing our own weaknesses, we grow stronger."
Riku's choice of the middle road - neither light nor dark - seems to be his choice of accepting both of his sides, and harmonizing them. And it doesn't lead to dusk - the end of things, the final moments, such. For him, it leads to dawn, where he finds a new day, new beginnings, and new adventure. It's very Riku-like, to me, and the original concept of light and ark is extremely well thought-out. As slammed as KH is sometimes for being too childish, one has to have an open mind to really find the depth in the plot and characters, or one has to be mind-numbingly naive to shallowly find interest in such a seemingly "simple" plot.
Does that make sense?
Ahaha, wow, that was a great first post here! <3 ;P