I’m pretty new to saddle hunting and even newer to rappelling. I understand how this works from the photos and it sounds like it works well. Where my questions come are from the extra complexity compared to other options. Why not use a delta/quick link for the girth hitch and exclude the biner? The tether from the biner to the rappel ring seems very smart to make sure nothing can drop to the ground, but I’m missing the benefit of the second device.
Is it to make it easier to remove/loosen for moving? I’ve not had experience trying to pull any rappel setup down so I’m sure it’s something functional that I don’t know due to a lack of experience. You haven’t shown a reason to add complexity for no reason so I’m sure I’m just inexperienced.
Also, the pole idea seems like it would be a great use for any climbing. I always feel uncomfortable climbing with just a linesman belt as I know I’m a bit clumsy at times. With that in mind, I always like to have a tether as well. Using the pole so I only reposition the tether once in a climb (and likely out of an abundance of caution/fear place a second low tether while using the pole) would really save a lot of time for me in repositioning things every step or two.