As Jesse stated, if you are using the Spektrum Rx along with the 3GX, then you will plug the satellite into the Rx.
Great. How does this look? Purple wire now along with red/black in THR in Spektrum rx and the red/white back into the BATT/AUX out on the 3GX with the red wire toward the outside (right side in my picture). Rx is already bound to the transmitter, so now it's just shuffling the wiring and then setting up the 3GX?