Board Thread:Naruto Discussions/@comment-32617252-20180630010918/@comment-6769189-20180701100309

Like i said, the bijuu have SIMIlAR principles as shadow clones.

Even shadow clones have souls as the Reaper ripped souls out of Shadow Clones.
 * Shadow clones are beings made of chakra. Bijuu are beings made of chakra.
 * Shadow Clones have souls that the Reaper finds to be acceptible sacrifices.
 * Orochimaru can basically bring himself back to life with chakra he has sealed in other people. After marking Sasuke, there could have potentially been 7 more Orochimaru's in existance.

Apparently chakra does have a soul. That is probably what the spiritual energy portion of chakra is. It seems the only difference between Shadow clones and Bijuu are that Bijuu are self sustaining.