Board Thread:Versus Debates/@comment-30168130-20161130052129/@comment-25122992-20161130132850

Nagato (Pain) never absorbed Shizune's chakra. He just used Human Path (not Preta) to rip the soul out of her body and gain her knowlegde. It's completely different from the actual chakra absorption since chakra and soul still aren't the same thing. Otherwise, Pain would've always used Human Path to absorb chakra instead of Preta.