Cause it come back to a few things.
Diff. game would require a VERY long balancing since at this point zelaron melee is still new.
Cause without major balancing it could come to team like Kuja, Magus, Lloyd and it's game over.
Zelaron Melee currently lack way to much activity.
Rules are already made true but i am quite sure that they will be subject to minor or major change/tweeking.

Having said that. It would be much better to aproach something simplier for now in the sake of getting more activity, becoming more familiar with the system and waiting a little longer till the rules are less subject to change.