Wow, that might actually be what square was going for. I never thought of it like that. But, just because Zidane protects Quina, it doesn't mean that Quina's a girl. Maybe the game creator thought it would add to the mystery if every once in a while they tricked you with calling 'it' a he and protecting 'it' when 'it's' HP was low. I suppose it doesn't really matter though, everyone is going to think what they want about Quina no matter what evidence is brought up.