Verified answer

Actually it hasn't been confirmed that it's even pein jutsu, according to pein the guy who ripped the soul out of the kohona ninja was called "human realm". It's possible that like several other akatsuki members abilities, so to does peins ability act like some kind of a hypnosis or puppet jutsu. Maybe this jutsu belongs or belonged to whoever that person is only until he's killed or it's explained what or who exactly "human realm" is then we will really know.

But all in all yeah it was cool.

Obito will probable change components and then madara will probable be like "ok this ends now" and does some loopy large attack then hashirama shows up with some large mokuton technique then its going to be madara vs every physique lol. Or sasuke could ensue and shop then along with his EMS large extensive susanoo. must be exciting. shinobi alliance has: -Senju Hashirama -3 ninjas with severe point area-time ninjutsu (Minato, Tobirama, Kakashi, and doubtless Obito if he switches) -Orochimaru wisdom and unusual techniques -EMS Sasuke -Shikamaru's brainpower -Naruto's chakra Haha if Obito switches components and warps Madara to the different measurement and sasuke amaterasus the ten tails, that's game over.