Jason,
Your last response in post 25 still sounds a bit confused, in part due to assumption about some very old-time flash knowledge, so let me provide a bit of clarification...
- M-sync vs. FL-sync or X-sync..'synchronization' of flash: an electronic flash in synchronized to the opening of the shutter, no delay period is necessary for electronic flash, while M-sync bulbs and FL-synch bulbs need built-in timing considerations
- 'M' vs. Auto vs. nTTL ... deals with Exposure Automation of flash output:
- 'Manual' flash has no exposure automation at all, you need to set aperture of lens per some computation done by user;
- 'Auto' uses photosensor in the flash to stop light output when enough light has been reflected back from the subject.
- nTTL uses in-camera flash metering;
- Bullet 1 mostly has no direct association with Bullet 2. nTTL flash automation is normally done via hotshoe with multiple electrical contacts in the shoe; but there are hotshoes with only 2-3 contacts, which are not camera TTL metered at all.
- A camera can have a single flash sync socket, with a choice of M or X or FP sync setting via that contact; some cameras have a contact for one type of sync, and a different contract for another type of sync.
- A sync cord like PC cord usually is for triggering a Manual power flash, or an Auto power flash, but cannot trigger a TTL-controlled flash with exposure automation.
At the camera side your cord will have a PC connector, and on the flash side the cord can have
- a hotshoe, into which the Godox hotfoot is inserted, or
- it can have the male end that fits into the Godox flash connector socket, or
- it can be connected to a radio remote flash trigger transmitter which triggers the Godox via radio signal
...but regardless, the Godox will only fire in Manual output setting because the camera has no flash automation control capability and the flash has no Auto mode photosensor.
The Guide Number for a zoom head is ordinarily stated (for marketing boasting) at the Longest FL setting of the zoom head, so knowing the GN does nothing for the user when the zoom head is used at any other zoom position, since Godox provides no table of GN values at different zoom FL (nor any table of GN values for fractional power settings in Manual output mode).