Are we sure he's Zuko's son? Didn't the Korra game say the he had a daughter? It could be his grandson.
And Bumi seems to be using the same uniform as Iroh. Does this mean he's general too?
Then I guess Capcom made a good choice if the reaction is so much better.
There's many people who'd prefer an anime-style spin-off over a realistic shooter so It makes sense that they're getting more excited over this than LP3. And it's not really that uncommon for people to be more interested...
KH sells better in the west. 360 is currently surpassing every other console in sales in the west. It wouldn't be that strange to see it in the 360. That is, if it were to be released this generation.