Wow. Just wow. Apparently KY would have us believe that the uchihas (that he adores to no end) all know how to use an elemental jutsu as little kids (Fireball jutsu) to show they meet the requirements to be taken seriously as adults/ninjas, BUT Minato who was the Fucking Hokage can't even do that much.
I'll say it one more time KY. Minato would have to already know how to use elements if it was his intention to combine it with Rasengan. It would be completely illogical to create the damn jutsu first and then learn elements afterwards. Just like if a little kid had the "intention" of learning how to ride a bike, he would first need to fucking own one.