Board Thread:Naruto Discussions/@comment-30168130-20161009021213/@comment-1872728-20161009142318

Elveonora wrote: No, the Orochimaru Senjutsu chakra was said to be from Anko's Curse Mark. Well, since the Curse Mark is modified from Sage Transformation, maybe the Curse Mark absorbs Natural Energy passively, but you have to activate it to use it. This also means that it started with Orochimaru's Chakra at the moment it's branded, but upon being branded, it's in a constant state of being changed into Orochimaru's Sage Chakra.

Idk, it just sounds more reasonable to me, because if Orochimaru is not compatible with Sage Mode, it's impossible for him to put Sage Chakra into the Curse Marks beforehand.