Quistis just isn't Irvine's type. It's obvious enough since his favorite is Selphie, who's cute and short and as far as outward appearances go, Rinoa fit that kind of 'mold' more than Quistis did. It's not like Irvine could carry it off anyway >.> The only one who can stand next to Quistis (this is purely my opinion) and not be overpowered is Seifer