I think you’d be hard pressed to prove that pairing spokes makes the wheel more aero. I don’t even think Rolf claims pairing is more aero. He just claims it’s different technology, which I agree with. Kind of like internal headsets.
Thinking back to why he made these wheels, they were in essence a Campy Shamal. Then Trek got a hold of them and they became something else (machine build, lower profile, exposed nipples, etc). If you could get a test of a Shamal and a Vigor I doubt that there would be much difference aero wise. Same rim depth, same (I think) number of spokes, internal nipples, etc. I like Rolf, he’s a cool guy, hopefully made some good money out of the Trek deal (now Bontrager), and his wheels really are good.