Touche.
Anywho, what I stated still stands. Both in terms of system, as well as what he appears to be built up as, it seems to me that Alex, though originally intended to become playable, has evolved into something different. At this point, considering the mechanics of Golden Sun, the only way for him to really be playable anymore is to have a standalone game with much different mechanics, and with him as the sole PC. The fact that he's absorbed both the power of the Golden Sun, as well as likely the power of at least one of the raw fundaments as well, means that in the context of traditional play he'd be certain to break all the rules, or make no sense if he didn't.