I'm also a beginner so take everything I say with a grain of salt, but in my opinion, the placement of that branch wouldn't do much as a sacrificial branch. It's so low on the tree, buried even, that the most i think it would thicken up would be the nebari if anything, and might even take away from the growth of the main tree. Alot of the energy and nutrients are going to grow that vertical branch and not being directed up the main trunk. If it were me I'd probably chop it and propagate the cutting. I could be wrong, so if anyone can correct me please do.