You do realize SE has never made anything "challenging". They've made things with horrible drop rates, or random "screw you" moves, otherwise nothing is "challenging". If they think this fight is "too easy" then the next version will spam -ja's with instant-cast speed, use 1000~2000 damage aoe's back to back, have a variety of instant death moves and a maybe a charmga just for good measure. Or they could just have to chainspell meteor.

What that be "challenging" enough for you?