well jiraya's traning was for naruto to become better with his already existin techniques and also how to control the kyuubi's chakra that's the only thing that jiraya has taught naruto. But Kakashi and Yamatos training concentrate more on using naruto's own strength and chakra.
yeah there were other thinks as well narutos speed to create kagebunshin and the mass increased from what kakashis sead in the 2 episode he learned the odama rasengan how to dispel genjutsu what happens if you cant dispel it then you have to get help from teammates and many many other things
i think j-man just taught naruto how to utilize his jutsu and taught naruto to time his jutsu to sum it j-man just taught how to improve on using his jutsu
and for kakashi and tenzo is to make a jutsu while conserving his time
jiraiya did teach him how to improve his technique but i think he focues more on important things like controling the kyubii and helping naruto to understand his powers more, but he already knew naruto had a natural ability to get stronger faster without using kakashi's method. but i think ero sennin was tryna help him grow up faster and learn to b more effcient when fighting
Actually I dont think we are going to see what the code means in this chapter. We are probably just going to see shikamaru going around and trying to ask people questions about it (like kakashi and the fifth)