Seriously, what's up with this new trend of downplaying Kakashi's genius? Kakashi was a natural prodigy, just like Minato. Also remember that Kakashi graduated from the Academy at a jaw-dropping age of 5 (I don't even know how that's possible), while Minato graduated some time later (NPedia says that, in the databooks, it states that Minato graduated at 10), so if anything, Kakashi was more of a prodigy than Minato (though Kakashi was a child soldier).
On top of that, Minato created the Rasengan later on in life - adulthood - while Kakashi created the Chidori/Raikiri when he was 13 years old, so there's his genius creativity as well.
On top of that, Minato created the Rasengan later on in life - adulthood - while Kakashi created the Chidori/Raikiri when he was 13 years old, so there's his genius creativity as well.