Quote Originally Posted by Elessar
So exactly where do all you people read, that Sasuke has a natural affinity of the same amount (or it would be one again) to two types?

Naruto _asks_ if Sasuke has two, and that question _isn't_answered_at_all_. It is stated that in the Uchiha clan there were exceptionally many people with fire affinity and that Kakashi is lighning, therefor chidori. Sasuke being able to learn chidori and further developing it, means he is most likely lightning - _NOT_ fire. He learned fire jutsu, because they are an Uchiha trademark. He can, until proven otherwise, not transform his chakra into fire.
"Naruto: So Sasuke's matched with both Fire and Lightning, then?
Kakashi: You , on the other hand, are a zero."

You can overanalyze all you want, but there IS such a thing as answering a question with a different, but relevant response. If you asked someone how old they are and they tell you they will be turning 21 next month...wouldn't that answer your question just the same?

Not only that, but kakashi says naruto is a zero, even though we know that he is capable of learning wind. This suggests that their use of the term affinity does not mean "what you are naturally attuned to", but rather "what you have trained your body to mold chakra into"