Agreed Andi76 hence why I used the word "lead". There are other talented people doing the work, but maybe his direction or critique is crtical in getting the best from the team.
Looking on the W14
I am starting to see why the Zero-pod is so different. Look on the floor treatment between the two cars.
W14 has a very steep drop off to the edge of the floor at the base of the sidepod.
RB19 relatively flat going outwards from the undercut to the edge of the floor.
W14 is heavily dependent on the mid wing, compared to RB19 that uses that whole funnel underneath the sidepod to push higher volumes of air outward. Some it jets and squirt between the undercut. And above the sidepod, at the lump behind the opening, more air is pushed outward at mid height of the car.
The squirt between the narrow point of the undercut goes to the diffuser mouse hole and also sheilds the floor and provide out wash, and the rest of the flow at mid-rift is dealing with tyre wake. Then you have above the sidepod that is doing pressure recovery.
The Zero-pod just has less surfaces to play around with. It has a low drag advantage, but it seems to not be able to enhance the floor and diffuser performance as much as the other cars. The mid-wing is left to do all of that.
Zero-pod is heavily dependent on a super effective floor and diffuser to take advantage of it's facilitation of high energy flow past the side of the car.
Another thing, why does the floor seem so thick with W14 and not the other cars? It's almost seems to be deeper and skirted.
