As we know in the beginning in the Zabuza saga, at that stage Sasuke was superior than Naruto. Sasuke had the better skill, jutsu and technique and especially the feat. Once Naruto started using Kurama chakra, then in part 1 Naruto surpassed Sasuke.
Here is proof of it
Sasuke with his own powers can train and train, but still inferior to Naruto + Kurama. This proof a Jinchuuriki got a huge advantage over someone using their own natural power.
Sasuke to catch up to Naruto well Sasuke used the drug to awaken his CM to CM2 and gain full control.
This is crazy to be honest, this manga is about who has the best outside source power instead of training, the best ninja with no outside source power are these:
Hashirama
Gai
Lee
Raikages
There more but the list would be too huge.
Here is proof of it
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Sasuke with his own powers can train and train, but still inferior to Naruto + Kurama. This proof a Jinchuuriki got a huge advantage over someone using their own natural power.
Sasuke to catch up to Naruto well Sasuke used the drug to awaken his CM to CM2 and gain full control.
This is crazy to be honest, this manga is about who has the best outside source power instead of training, the best ninja with no outside source power are these:
Hashirama
Gai
Lee
Raikages
There more but the list would be too huge.