Solved

Employees

Could somebody explain a lil bit more about the relevance of the employees?

I understand that the level of the TD affects in how much points can research from other teams. The highest level, highest is the gain. Is that right? Affects to anything else?

The DR lvl as far as I know... doesn't matter?

The CD only affects in the weaknesses and the strenghts? Because I understand that the design points are from the facility, so again... doesn't matter the level of him?

There is a tooltip next to each staff role on the drivers and staff page which describes their roles.

Tech gives suggested pit stops to Drivers on the strategy page also and impacts the Estimated laps & fuel calculations. The closer to your level the more Stars they have.
Doctor is how much stamina you lose in training higher their level to yous the more stars they have.
Designer works with the Tech to apply the spied design points, so I guess they higher the Stars the more spied points you get.

How a staff members level is worked out I don't understand, it's a bit confusing.