I still think a driver inside a team has a better understanding of what's going on aero-wise then any of us. We are talking about drivers with a huge commitment to their teams; they are pretty much involved and probably will have the proper knowledge.Really? Neither of these two are engineers. I don't see why a driver would have a better technical understanding than an engineer. Just my two cents, but there are plenty on this forum with a better technical understanding of f1 cars than most f1 drivers.
We have a lot of wise and smart people around here, but f1 drivers can be generally be assumed to be too, and they have inside information on their cars. They've seen windtunnel and cfd numbers, on-track data, setup variables etc. It would be rather foolish to believe any normal engineer outside a team has a better aero understanding of a specific car, then the person driving it.