if you add Sanda into it then it could work in MMA.
I trained my whole life in different Chinese martial arts and Kung Fu. After I learned everything, I was determined to enter the UFC and prove to the world that Chinese Kung fu were real and useful in combat.
Movies · Emmanuel_Capricorn
but the character is an OP one so why fear the golden lion
you should have a set up chapter before plunging into sanada is suspected, a chapter for the third guilt dealing with his student and his teacher disappointment, we should get into his mindset first. then open the next chapter with conflict between the third guilt and Danzo with how to deal with Sanada sudden power upgrade. the next chapter then should be dealing with Sanada thought and reflecting what he should and shouldn't do, a conflict of his mind between following canon when convention to him or doing what right even if canon is no more. and while Naruto and Jiraiya retrieve tsunade if you follow it, make a relaxing chapter flesh out the main character with interaction with other jonin sensei. personally your story is very fast paced which is not wrong but the story felt it has no set up and just happen to me at least, also instead showing the system you could make it as a passing.
ch 56 Ch 55 : The aftermath of Chunin Exam -edited-
Anime & Comics · Rysangel
which chapter anyway, that state or reference that our MC will go to Naruto world?
in canon Henge is a physical transformation, at least get your jutsu to follow the canon rules.
ch 25 Done Something amazing
Naruto: Chronicles of a Fire Ninja
Fantasy · FirstHokage