Good to have this verified. As I said I'm no expert on all this.
I was specifically referring to deep sleep mode.
So even though others have successfully kept a pin LOW that was set as Output LOW before going into Deep Sleep to keep as mentioned in the link below to keep a Adafruit Ultimate GPS module in sleep mode while the Photon was in Deep Sleep mode that some static electricity has the potential to push that Hi-z pin-up past the voltage that the Ultimate GPS module considers low and the only way to guarantee it stays low is to use a pull-down resistor?
That makes sense to me.
I was just assuming that the Output Pin set LOW during a Hi-Z Sleep state would normally stay close enough to where it was before going into deep sleep that the connected device would still consider it LOW and remain OFF, which it does for some devices. To assume this would be true in all cases would be a mistake and to make sure the Enable pin stays low one should use a Pull Down resistor?
Am I on the right track with that line of thinking?