coupled to an rz 67 pro (non D) HX701 adapter I'm using a Canon sync cable from lens to the flash sync port on the digital back. (and a small adapter so the jack fitting fits the DB). I have the menu set to an rz67 on the DB.
Ive tested the canon sync cable connected from the lens to a free standing pocket wizard and it works. It fired the flash!
From what I have read I shouldnt need a camera control cable that runs from the camera to the back. Only the sync cable from camera to flash sync port>