Originally Posted by Nexus
Perhaps, Sasori used a jutsu similar to Chiyo's with Gaara's revival to transport his soul within the puppet.
Maybe, but I don't think so. Do you remember how Chiyo made her hand a puppet hand when it was needed to make a chakra shield against Iron Sand? She also mentioned that only Sasori is able to make puppets out of humans so they retain the abilities they had while alive.
I don't know, maybe even Kishi never thought of that, lol.