(haven't read the books) That's true but if you notice even after he changed his apperance, his voice stayed the same. Of course if he's that kind of warrior he could probably change his voice too. But I love the potential 'Arya going off to be trained as an assassin' bit. Hopefully that somehow develops in the future
It's so prevalent in books (Alex Rider, artemis fowl, harry potter) it's about time one of them became a killer instead.