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He had an explanation though - the Third Raikage had one of the toughest body out there. Wounding him was very difficult, while Tobirama didn't have that kind of resiliency or ability to heal like Hashirama does.
So you're kinda wrong here.
Rock Lee SD is made by one of his old assistants who was a good friend of his who asked if he could make a spin-off series off of Naruto.
It was his good friend so he was like "sure" as you would.
Kishimoto spends zero time on Rock Lee SD.