Well, in Naruto, rank means a lot. Naruto is a genin still simply due to the story and Kabuto is actually a missing nin if I remember correctly
But their ranks show how much battle experience and skill they possess based on the shinobi combat system and the people, aka the Hokage, ranking their abilities and skills. Just because Sasuke has shown more than Gaiden Kakashi doesn't mean they are even close to equal. Sasuke is a main character so it is obvious more will have been shown than Gaiden Kakashi, since we've only seen him in 6 chapters at that point.
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