Excasr. Nice guy. Granted me a merry Christmas. Has the most posts in this thread. -.-
Actually if you play the GBA CoM you see that he didn't die right away. He reveals he's not dead after you beat him. In RE:CoM they had to show a losing animation and well... fading into darkness was the poor choice they chose. Ultimately Axel was to be killed by Roxas before Sora was awake. Which would have been quite ironic... but fans liked him so much that they kept him alive.