Pure guess:
The technique uses the sacrifice chakra, all of it. Hence the sacrifice.
Chakra is needed for the body to function, all organs need it.
Sassori rid himself of all organs and body parts just to keep a core, in order to free chakra lines to be able to control more puppets.
So the guess is that everyone -excep jinchuriki- has more or less the same chakra potential. The difference is in how much is free to use techniques and how training enables you to free a little more chakra.
Endo tensei probably accesses all of the chakra in the scarifices body, stopping all body functions at some point.