I may be wrong but I think that Orochimaru played a hand in the death of Tsunade's brother. I think he killed Naeaki and took his dna.Why?
Because of this
My other theory is Nawaki isn't dead at all.I think that he was waiting to get Sasuke but the third hokage ruined oro's plans. I think Oro kidnapped him. I think that Oro was already making moves in trying to discover many new justus. Oro had senju dna. I think he got it from Nawaki. Now this is far fetched but Nawaki could be the person that Sasiuke wants to speak to. I could be completely wrong. Even Oro stated that they couldn't recognize the body. Maybe he did something that made that possible. I think Oro was trying to obtain the rinnegan.
I got the idea from here
Flame me if you like but this was a theory i just wanted to throw out there. Thoughts
If this has already been made I apologize. Also apologize for the misspelling of the names.
Because of this
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My other theory is Nawaki isn't dead at all.I think that he was waiting to get Sasuke but the third hokage ruined oro's plans. I think Oro kidnapped him. I think that Oro was already making moves in trying to discover many new justus. Oro had senju dna. I think he got it from Nawaki. Now this is far fetched but Nawaki could be the person that Sasiuke wants to speak to. I could be completely wrong. Even Oro stated that they couldn't recognize the body. Maybe he did something that made that possible. I think Oro was trying to obtain the rinnegan.
I got the idea from here
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Flame me if you like but this was a theory i just wanted to throw out there. Thoughts
If this has already been made I apologize. Also apologize for the misspelling of the names.