Board Thread:Theories and Speculation/@comment-24901923-20161130025154/@comment-25122992-20161130212046

Fistly, Fury debuted before the actual concept of the "nature energy" and its use in form of SM was introduced, so there's still a chance that "NE" of Fury and "NE" of SM weren't meant to be the same thing. Also, it's not like it was mentioned that neither of Tsuchigumo clan had any connection to the NE. Secondly, Amplification Summoning obviously wasn't made from summoning single dogs and combining them into one entity, it just gave a single dog the ability to mulpiply itself, only with a certain condition (it must be damaged). Nothing implies that it's somehow connected to fuinjutsu.