The update didn't have the usual humor the dojo has, and the lack of a "new challenger aproaching!" made me believe at first Sheik was an assist trophy. Now since in Ocarina Sheik transforms into Zelda through magic instead of just taking off the mask and cloths I still believe Sheik is male, or at least genderless, Zelda's body is completely different while in Sheik's form.
It would've been cooler a cloaked Zelda from TP (it even had the sheikah symbol and everything) instead of Sheik now that I think about it, but I'll live, and the sheik model looks great.