Actually, I was quite the opposite. When he "died" I was "don't tell me this is Xigbar's end after years of erratic behavior and cryptic sentence that makes everyone think he knows more about everything than any other character in the entire series". Specially after the Olympus cut sentence of "May your heart be..." I was kind of waiting for a big reveal, and when he just say those about wanting a keyblade I almost have a heart attack. I mean, everybody in this series has a key blade now, Yen Sid has a fabric, you just have to go there and ask nicely. So... it was a relieve after seeing the ending.
The Luxu thing quite confused me, after all. Like it has been stated in the thread, their mannerism remembers the MoM, so I was hoping that he turns to be him. And besides, Luxu looks kind of naïve to me in Back Cover, just following his master orders without questioning, but that might be just because he was too young: he might have centuries know but yet... I admit I didn't see that coming and I'm still quite of... don't know, maybe I just forged me a wrong impression but Back Cover Luxu just wasn't manipulative at all. What happened to him?