Re: wow itachi uses suiton too...
No , in the Manga he has Doton , Raiton and Suiton.
in anime kakashi has 4 elements excluding wind, in manga he has 3 elements excluding fire and wind.
He doesn't have Katon or Fuuton
Yes he's right , Sharingan allow you to copy the jutsu that you have the element for , only Rinnegan allow you to use all of the element.
Itachi is known to be Suiton user for a decade, he used it in Part I. also no, Sharingan doesn't allow anyone to use all elements, just because the eyes copy things doesn't make it so the user can use it, he still needs to train chakra nature change to do that.