In Naruto, why didn't the four generations of Naruto teach Kakashi the skills of flying Raytheon?

In Naruto, why didn't the four generations of Naruto teach Kakashi the skills of flying Raytheon? Huo Ying's four generations of flying Raytheon technology can be described as its own label. With this move, four generations of Huo Ying were invincible and became the "yellow flash" at that time, claiming to be the first person in the field of speed. Unfortunately, this move has not been handed down.

For Fei Raytheon, the previous four generations were taught to protect themselves, and Shiranui Genma was one of them. This is definitely a suitable supporting role in Huo Ying, and it is only very tolerant, but among the three people here, Shiranui Genma's personal data is far ahead. The eight items of Ninja are: Endure 9, Fantasy 6, Sage 6, Strength 6, Speed 6, Precision 7, Seal 6, 8, with a total score of 54 points. This is already a high achievement in patience. But nothing stands out at all. Even chakra is like Kakashi, and the others are worse.

So all three of them can learn well, even if Kakashi can't, of course, although they can, they must work together to use it. In the eyes of many people, Kakashi is the most likely to inherit the role of Thor, but why didn't Kakashi be taught for four generations?

1: There is no direct obligation. Kakashi and the fourth generation are teachers and students, but they are not apprentices. Therefore, there is no need to teach Kakashi anything under the same roof. It depends entirely on the teacher, just like Kakashi helps thousands of birds. And Kakashi has been forbearing at the age of six and at the age of twelve.

That is to say, Kakashi and the fourth generation are more colleagues than teachers and students, which also leads to Kakashi not performing many tasks with the next four generations, not to mention joining the dark department not long after, not as close as the guards, so there is not much time to guide, plus the fourth generation itself died young.

2.sharingan In fact, every ninja with a well-known number is nothing more than having his own ability to stand in the world. Therefore, at the moment Kakashi got sharingan, he finally needed to take a completely different road from the four generations. Sharingan is a weapon that many people miss so much, and Kakashi immediately had this weapon.

It is better to practice Saringan wholeheartedly than to learn from Flying Raytheon. Moreover, Saringan and Thousand Birds are supporting facilities and have gradually created their own titles, so there is no need to give Professor Flying Raytheon to Kakashi in the fourth generation. For Kakashi himself, there is no need to fly Raytheon.

So in general, the apprentice must live for himself in the future, which is more suitable for his own way. Therefore, even if there was no sharingan after Kakashi, he actually left the third generation line in Huo Ying. After all, as a ninja with complete characteristics, he copied thousands of ninja skills at an early age. Wouldn't it be a waste if he didn't take the road of three generations?