Originally posted by Kuja Trance
You can also take him out before Trance Kuja which I usually do. I tend to replace him for Freya, going with Freya, Steiner, Vivi and Garnet.
It figures someone named Kuja Trance would know about this.

Anyways, I didn't even know you could interchange Zidane with other characters, but in any case I wouldn't replace him anyways. I never caught 99 frogs with Quina, so there wasn't a 9,999 damage attack for him/her, and I never got Dragon Crest for Freya, so she was useless to me as well. I used the most balanced team in the game, or so I've read. Zidane, Vivi, Garnet, and Steiner.