This entire series, especially after the Sasuke retrieval arc has focused solely on that character. He left their village and joined Orochimaru in order to gain power, which ultimately made him a criminal. After some time, kills his brother (achieves his goal) realizes that he was wrong and joins an international criminal organization. After joining this group he had made it clear that his goal was to wipe out Konoha. However, even with this knowledge the deuteragonist decides to still to try to save him.
If you think about, this basically summarizes the entire Naruto story (excluding the war) everything that was solely about Naruto or other characters was mainly filler (not all tho). Why does the actual story mainly revolve around Sasuke? Was he the intended main character, but due to the Shounen loud mouth MC rule Kishi had to resort to Naruto?
Why did the female Konoah 11 members ( not all) want such person back in their village? Why did Kakashi and Sakura keep quiet about the fact that he attempted to eliminate the Kages as well as Naruto? You'd think Kakashi was smarter, eh? I mean, lets leave a manipulable man to roam our village. This goes for the other villages as well.
The only thing Sasuke was missing in his achievements was being Kage; everything else he's taken from Naruto (deuteragonist)
Who was the intended main character? In my honest opinion, it seems like Sauce is. This series was about him, and everything was handed to him in a silver platter.
Note: Sorry for any mistakes, wrote this before i went to bed