I think that perhaps people expected Terra to be Terra from FF6, who is female.
Sadly that means that they'll probably never add Terra to the KH franchise now that they already have a Terra... Unless they call her Tina.
They can still put her in the game which the name Terra they did that with FFX-2 Rikku even though there was a Riku already in the game, but then again one does have two Ks and the other only has one, so maybe they will call her Tina, because they did get Aerith's (sp) name right in KH since in English vers of FF7 she was called Aeris
