Hiruzen probably knew how to use B.O.D too...

[Supermacaquecool]

I'm really confused. Thought that Hiruzen's sensei was Tobirama.

 

[Owarij]

I'm really confused. Thought that Hiruzen's sensei was Tobirama.

Both hashirama and tobirama were hiruzen's senseis

 

[MangekyouJ]

BOD vs BOD wouldn't really achieve much, would it? Then both parties would be blind.

To a certain degree...yes, but I have to agree with him being of age where his chakra being low grade.....BOD would've probably been too much for him to handle it and Oro probably knew it....but answer accepted nonetheless...xd