Can Leo and Banon be recruited in the World of Ruin?

I wanted Leo to be a equipable temporary character in my hack in the WOB between the departure at Albrook and the events where he is killed. It seems to be a rather more complicated task than what I imagined...

For the FF6: Return of the Dark Sorcerer Hack, Leo will be playable after the banquet (when you get to Albrook), and all the way through the fire house in Thamasa. As of now, he leaves with shadow in search for the espers. However, it seems it might change now at any time.

However, he's not equippable at any time, nor can he equip espers (I think).