First part:
SPOILER!!:

He destroys the Sun Cryst with both the Treaty Blade and the Sword of Kings on top of the Pharos at Ridorana. The resulting explosion of Myst kills him and creates enough energy for Vanye to power up and unleash the Sky Fortress Bahamut.

Im not too sure what you were asking in the second question, but I answered it the best I could.

Something tells me this should really be in the Trivia thread, but oh well.