in my opinion kakashi is more "skilled" but itachi would be a tougher opponent..
i think naruto was unfortunate not have minato as his mentor, thats why u cant really comapre naruto with the rest...they were all receiving top class training from the get go while naruto wasn't, kakashi the son of white fang, suske and itachi's father was high rnked officer? so if minato didn sacrifice himself i think it would be a whole diff scenario
In a way I don't agree.. Sasuke only learned Katon: Gokakyu No Jutsu (Fire Element: Great Fireball) from his father as far as we know.. and some kunai an shuriken training from watching his brother.
So he didn't have much help from his clan trainingwise.
Kakashi also didn't receive much training from his father who commited suicide when Kakashi was still very young (about the age Sasuke was when the Uchiha were wiped out)
as for the argument..Jiraya trained Minato, Jiraya trained Naruto
In a way if Minato was so strong it was because of Jiraya..so the same applies to Naruto.
But, in my understanding, the best and most powerfull strengh Minato and Naruto received from Jiraya that makes the 3 the most powerful of their generation and is also one of the pillares of the series is "The guts to never give up"
but that is just my opinion!
still..I consider Itachi up till the momment the top shinobi among the ones that were listed..and as far as the argumment of Kakashi having a vast numer of tecniques copied..we can only imagine what Itachi had (let's also consider that from early age itachi was surronded by top konoha shinobis and since he left konoha and joined akatsuki he was surronded by SUPER top rogue shinobis (including Tobi-Madara) so u can really just imagine what he had learned!)