Having a natural affinity to an element doesn't automatically make you better at that element than people without an affinity for that element. It gives you an advantage sure but skill can easily close that gap.
I agree with the last sentence, but the one with the affinity for the technique will have higher potential using that element than someone who doesn't. My problem with your thinking is that you're under the assumption that Hiruzen can master all elements like he has an affinity for them all. This is simply not true as that is a power associated with Rikudou's Power. This is why it makes no sense to me at all.
Sasuke is a perfect example. His natural affinity if katon because he is uchiha and hence why he was able to use it at a very young age, He prefers Raiton because it fits in better with his overall fighting style than katon does. yet he is arguably better at kakashi at raiton dispite kakashi having the natural advantage with chakra affinity.
That's hard to say. Sasuke has incorporated both Katon and Raiton and both seem to complement his fighting style.
Raiton seems to be Sasuke's affinity IMO. Kakashi mentioned how even took a large number of days (presumably under a week) and we have to take into consideration how Sasuke also effectively mastered Katon rather quickly as well. I believe it's fair to assume that since Sasuke mastered Raiton so quickly as well that it's also his affinity which makes sense when Indra is also associated with Raiton.
Hiruzen's natural affinity is katon, Yet all his other elements have show to be just as powerful and just as large.
That's a good argument, but that doesn't tell me how well he can perform Yin and Yang Release. To me, it doesn't make sense. I don't expect an Uchiha to perform Yang Release on the level that a Senju can as the Senju inherited Yang Release whereas the Uchiha didn't, so they're going to be less effective in utilizing it overall. Same thing with clans. Specific clans inherit hiden ninjutsu and so I don't expect a clan who has inherited Yang Release to use Yin Release on the same level as a clan that has inherited Yin Release. Hiruzen hasn't inherited both, so I cannot expect him to use it on the level as other clans can.
Why would using it on the level as Jonin enable him to defeat KN4 Naruto?
The statement is right there in front of you. The original owner of that eye outright stated kakashi both honed and mastered his sharingan eye, Manga fact.
Your the one contradicting the manga by denying the very scan i posted.
Manga has time and time again emphasized how only the original owner can use the power of the eyes to its full potential. Even Nagato who had vast experience with the Rinnegan was unable to use it on the level as Madara can despite having far more experience with it.
Since it's not Kakashi's eyes, he does not have the potential to master the power of Obito's Sharingan. That contradicts the manga.
Given that, it's a fair assumption that Obito commented on Kakashi's proficiency and skill in using the Sharingan.
I appreciate you giving a respectful response instead of degrading me unlike other members in this section.
@Draegod
Please stop complaining about me quoting you. Instead of complaining and treating me like shit, why not just ask politely? If you're so butt-hurt about it, I'll stop quoting you, but please stop being a baby about it.