As a million saddle hunters....get a million answers. A few thoughts...all are my opinion only....
1. Redundancy is fine so long as it doesn't overcomplicate your process. I have seen some systems that have redundancies that I believe may actually increase the risk of error / fall. You judge if your systems is overly complex. I can't entirely picture what you are saying, but in any case, this would be my only concern with what you've described.
2. Once at height and fully weighted on your primary tether, I see very little need for a backup. I guess this guy somehow managed to fall under such a scenario, but you really have to mess up your knots in order for this to happen.
3. My opinion is redundancy is mainly useful during climb, descent, and the transition between climbing/descending and hanging at hunting height. You are mainly backing up the human in the system, not the equipment....
I wear a lightweight RC harness under my saddle, climb with lineman's belt connected to my saddle lineman's loops and back up tether connected to belay loop on harness (moving tether up above sticks / steps / bolts as I climb). When I get to height, I connect main tether to saddle bridge, loosen lineman's belt until fully weighted on main tether, then remove lineman's belt. I have the backup tether still hooked to my RC harness during the hunt. I feel better with this and I don't think it adds much complexity. But, that's just my opinion.....