Izuna knew Danzo wasn't an easy opponent. Sasuke was able to beat Danzo just out of pure luck as he was holding back to fight against Tobi and was wary of any surprise attack from Tobi. Another factor was that Danzo was old at that time and wasn't able to utilize hashirama's cells skilfully. Although the current Danzo didn't have Shisui's Mangekyo he still had someone else's Sharingan in his right eye. And guessing from the look of his right hand the arm of Shin Uchiha is yet to be transplanted which means Orochimaru had yet to transplant Hashirama's cells.
Reborn in Naruto As Madara's Grandson
Anime & Comics · ForgottenLife
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