Kakashi hidden novel prologue + questions

[Anastacia]

Here are 2 translated chapters if anyone hasn't seen them yet. I have a question about Kakashi's sharingan. How come he can't use it anymore? he gained MS during the war, didn't he? and then it just disappeared?
prologue

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chapter 1

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[Shanks]

I am Tired of Giving Same old Answers . Once Again I will reply this Obito being Sage of Six path gave him that powers . He lost his Power when Obito Parted to Pure World .

He no longer has MS or Sharingan .

 

[Anastacia]

I am Tired of Giving Same old Answers . Once Again I will reply this Obito being Sage of Six path gave him that powers . He lost his Power when Obito Parted to Pure World .

He no longer has MS or Sharingan .

right, but didn't Obito die before Kakashi turned badass?

 

[Shanks]

right, but didn't Obito die before Kakashi turned badass?

Obito is a fourth Sage of Six Path . He can Transcends between the Worlds .