Well, one of the reasons he wants the Sharingan is its ability to let you use any elemental jutsu that you've copied with it. (Kakashi uses a copied Ice-Style jutsu in one of the movies)
However, that only works for jutsu you've copied, and not for jutsu you found a scroll for. For that, you would need some sort of super-bloodline -ability that gave you all the elements, not just the basic five. Which, rumour has it, is pretty much exactly what that one brat that Zabuza fought has, right?
So, in this case, Naruto might be the target, instead of Sasuke.
The Cursed Seal is delivered via a bite. What are the chances that Orochimaru's fangs would just shatter against the Knight Armour?