Board Thread:Theories and Speculation/@comment-29769110-20170212133139/@comment-27924662-20170216080934

Only 'rinnegan' is required to summon the 'gedo statue' and inorder to take it further(TT transformation) without the use of bijus, one can use very large amt off chakra/Nature energy(to substitute them as chakra reservoirs), after which kaguya would be back as new.