Naruto: How Come the Weakest System in Awakening Is Invincible?

After traveling through time and becoming Uchiha Kushui, although he has powerful bloodline power, he cannot learn ninjutsu no matter what. The weakest system awakens, and the beginning is to die... The mess begins Columnar cells? Isn't it just a healing ninjutsu? Kamui Sharingan? This storage bag is pretty good Uzumaki bloodline? What's the use of having so much chakra if you don't know ninjutsu? When the bad king meets the original boss... Uchiha Obito: Boss, take me! Madara: Take me to dance with you! Hashirama: What do you think of my granddaughter? Namikaze Minato: Teach me how to be faster!