I was watching a recent interview with Adrian on the RB19 development. I was surprised somewhat to listen to him explain how his main focus was the suspension. While he worked closely with the Team Aerodynamicists his primary goal was to create a suspension that allowed the Aero to keep the RB19 ride height as low as possible. My impression was the Rear Suspension is the RB19's Secret Sauce.
Well Adrian did perfect active suspension all those years ago at Williams so it’s one of those innovations he probably wishes was not banned so prematurely. I think his background is in aeronautics but decided to go into motorsport instead, hence why he’s such a good aerodynamicist.