Why would they be at all interested in finding out who is the better driver? They have signed them both. Only fanboys need to know which one is the best (and even then, if their driver comes out worse, they will argue how unfair the comparison criteria were).
hmm what ??? it's not about finding who is the better driver, it's about giving the best possible cars to both your drivers so they can achieve the best possible results, also so they can work on a car that is reliably giving correlated data, and at this stage is having 2 cars presenting the same measurements. And even if some doubt Kubica's talent as a tester and his feedback, you have confirmation from the sensors. How can you develop the car when the sensors give you 2 different values for the same setup ? geez, come on guys because it gets ridiculous.
Why would Russell agree to that?
because he is an employee
Whose future may be put in jeopardy here though? The Mercedes junior driver or the guy making a comeback for a couple of seasons?
Well according to British media Kubica is doing worse and he is the next Merc driver so I don't understand your question ?