There was a disaster in ten tail before Ootutuki Hagoromo, so Ootutuki Hagoromo sealed 10 tail on his body. He should be the first person to stand upright. Later, he was worried that the 10 tail would break the seal after his death, so he divided the 10 chakra into 0 to 9 tails and projected some chakras into the sky to form the moon, so he wanted to use the energy of the moon to complete the' moon'. 1
When Ninja Village was founded and its successor was chosen, there were two apprentices, the first generation of Qianshou and Ban. I felt that the idea of "thousand hands" was more suitable than the consciousness of the class, so I was appointed as the first generation, and the latter class refused to accept it, so I fought with the first generation of "thousand hands" and the latter class was defeated. So Naypyidaw's Sasuke inevitably got into a fight with Naruto. This is fate!
The wood in Muye Village is taken from the first generation of wooden grappling technology. Later, in the war in the Valley of Doomsday, Shalingan summoned Kyubi no Youko to defeat Diandian with all his strength, but he was also seriously injured and died during his illness. His younger brother succeeded Huo Ying. The second generation Huo Yingli escaped with water.
So the first generation and the second generation don't exist. You are right.
As for Sanren, although he was defeated by Shimada Hanzo, a mountain pepper fish, his strength was outstanding. It was named Sanren by Shimada Hanzo, a mountain pepper fish! 、
I don't know if it is the answer you want, I hope it will be adopted!