Kakashi, as the only descendant of Guang in the village, happens to have a "sharingan" connection with Kakashi, the top leader in the village. When Kakashi was young, he had deep feelings for the big picture in Neiguang. Otsuka entrusted his sharingan to Kakashi before, so he was very good to Sasuke when he was placed in classes. Kakashi didn't hide anything from Sasuke either. Sharingan's usage and his strongest endurance Rechet can basically be taught.
Orochimaru was just a pity, but before Kakashi was rare enough, orochimaru fell in love with him. Since he met his brother Skunk again, Sasuke realized the gap between himself and Skunk, and even Kakashi was not good-looking in front of Skunk, so he chose the more powerful orochimaru. But compared with Kakashi's attitude of regarding Sasuke as a "son", orochimaru prefers Sasuke as a tool. Orochimaru didn't rob Sasuke's body immediately because he wanted to fatten up before eating. In the past three years, Sasuke has not only developed his own ninja "Kirin", but also owned his own psychic beast "Wan Snake", and his vitality has also grown a lot, and the application of Saringan has become more complete. However, when the prey became fat, the hunter became the prey instead, and orochimaru was accidentally sealed by the skunk. When orochimaru came back to life again, the world changed and became Sasuke's pure "mother powder"!
Compared with Sasuke's strength before and after, orochimaru's education is even better. To say that these two people have a greater influence on Sasuke, personally, orochimaru is more helpful. Although Kakashi laid a good foundation for Sasuke, when it comes to promotion, it has to be orochimaru. For Sasuke, three years around orochimaru is a great promotion. Before leaving Konoha, his strength was similar to that of Naruto, but three years later, his strength was far above that of Naruto. I have to admit that orochimaru is very professional in cultivating this piece.