It actually took me a while to realise why that ending made me sad (given that it was essentially a good outcome for Vincent, not to mention the world had been saved), until I realised it was because while Vincent didn't have to sacrifice himself for the Planet, Chaos did (well, went dormant again - you know what I mean).
Beautifully put -- did you have the feeling that Chaos knew full well what he was doing, and that it meant goodbye? I got that vibe myself. Selfless sacrifice always gets to me.
I always wanted a fic about Vincent saying good bye to Chaos since then, and I guess this is the closest I've got so far, so...
Thank you. This means a lot, coming from another Chaos fan. ^___^ Keep an eye on my journal, I'm going to be writing an essay on my view of Chaos one of these days.