E, Did you see my post that I did earlier where I used your quotes a couple of times and responded to them?
Also, what do you mean "just below the header tee"? If you are talking about just above the bottom plate in that one picture, the line that is all by itself is a cold line supplying the old shower, I will use it in the new supply to the new tub/shower. Of the 3 lines that are all tied together, these are hot lines, one goes down to the old tub, but then it goes over and feeds the sinks, so I can't cap it off. I can basically cap that one under the tub above the slab, or I can cap it off below the slab. It just seems like if I ever had to fix a leak beneath the slab, it would be worse than fixing one just under the tub. On the manifold at the bottom plate, the other two lines that go down in the concrete, I believe these go off to another part of the house to feed other fixtures.