Once again, given is used in the sense of not original power. kakashi was confirmed to have a 1000 jutsu's and able to use, water, fire, earth and lightning. What you are talking about is the mixture of the techniques together to make another element or style. Thats called a toutai or something. Don't get that confused with using elements separately like kakashi.
No that was learning to use 1 element. When Kakashi trained Naruto he said it takes many years to learn an element and had Naruto train with clones to lessen the time needed. Naruto trained with 200 clones for a few weeks, that's 200 days worth of training each day.
Kakashi was only shown to use all of those jutsus after he uncovered the Sharingan, the only elements he used with it covered was earth and he stated lightning was his. If Kakashi had all of those elements then he would be able to use those jutsus without the Sharingan by already knowing how to perform them yet he doesn't. Mei has water, fire and earth elements and Oonoki have earth, wind and fire. Kakashi was said to copy 1000 jutsus not learn or created them.