I'd probably rofl.
Though, they could both be there if they wanted. Going OoT again, story-wise that Impa trains Zelda to be Sheik. But again, that'd only work if Impa trained Zelda off screen, before the story starts, we get an enourmous time lapse in the story, or travelling from the future / past makes a return. The latter seems most likely, but that would REALLY copy OoT too much.
TP was already received badly by some because it being slightly similar to OoT already. Probably due to this, and due to spoiling the plot, Sheik was scrapped from Twilight Princess. And again, not revived for the next major console release, but Impa was.
See where I'm going?
![Phone :phone: :phone:](/styles/default/xenforo/smilies/phone.png)