naruto is leagues ahead of jounin , he only has one , gaara may not have done any chakra nature training ,he had fuuton cus of shukaku so if he hasnt got shukaku he may not have wind
......:|....I was making a reference to what Kakashi said. Also, Naruto is a Genin by rank. Rank observes ability, which is why I think Gaara should have at least one being Kazekage an all.
I know that Shukaku used Wind Style techniques but Gaara has been shown to have wind style moves, such as sand bullets.
There is of course no confirmations in the Narutoverse that Gaara has any elemental affinity but there are strong indicators that he does/should.
I could also say that there are many other Chunin & Jonin who haven't been seen to use Elements but I doubt they don't have them.
I think Gaara does have Wind....xd