Board Thread:Theories and Speculation/@comment-35051547-20180320000346/@comment-734582-20180322111422

Ninja Of War wrote: Just a thought. I found the relation between wood release and the god tree to be more than coincidence. Yea, i think the connection there is intentional for sure. Him being a transmigrant, the wood release, the chakra absorbtion. I just don't necessarily think his Sage Mode is something special, though maybe his means of acquiring it is.

The toads learn sage mode from special oil, while the snakes apparently inject nature energy. The question then becomes, what made Hashirama see Nature energy, in order for him to get Sage Mode? Wood release could be a source, but why then do other giant-jutsu users not get the same effect?

It seems more logical to me that he's connected to some other animal realm that teaches Senjutsu.