Apparently the middle tool (2nd from the left) is called a Park 4th hand, and helps stretch the cable.
It looks like it may take some of the guess work out of setting the pinch bolt. But, I'm not quite sure I'd use it. I have had front derailleur adjustments that were a bit tricky, so I might use one there.
I don't see a reason to use a 3rd hand and a 4th hand together.