^Pain was already a "living indictment of the ninja system" (well, not so much on the living, but definitely the indictment...). And Orochimaru was already a container filled with multiple souls (since he seems to keep the souls of the bodies he posses), not to mention the Shinigami being a container of souls as well.
Not to say that Kishimoto won't simply recycle his ideas once again, but they are still recycled ideas...
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