Board Thread:Theories and Speculation/@comment-26005711-20150719134117/@comment-25626003-20150719160911

Not to mention after Obito regained control of himself he stole pieces of the One & Eight-Tails, ultimately becoming a psuedo-jin, not to mention Yin-Kurama. Anyway, Itachi's loss is what shaped him into the being what he became, and long before he even acquired the Rinnegan he had his mind up to attempt to reshape the world in a way he sees fit.....using Rinne Tensei at that point in time would've defeated the purpose. It makes sense.