The MS example is not a great one considering that most of the World Championship winning Benetton team came along with him!
I think its a good one, as he was still instrumental in getting the winning mentality at Ferrari going.
Without MS, there is absolutely noway that Brawn and Byrne would've had the impact they did. As an example, Brawn has now arrived at Honda and you seeing just how competitive those 2 drivers are.
Also, during those Bennetton and Ferrari years, you can see that MS's team mates didnt get a look in. I know that some people believe that they were told not to win, but that wouldnt have stopped them from finishing every race within a few seconds of his gearbox.
People also talk about MS's team mates becomming de-motivated. My take on this is that a top class driver will always find a level of motivation that makes him fast and competitive. Its impossible to demotivate Senna, Mansell, Hamilton, Alonso, etc. The top drivers generally rise to the top, even if driving 2nd rate cars. For example, we have seen Alonso deliver 2 wins in a poor car, this year.
But anyway, lets leave the, "whose the best, he's the best, no he's crap" talk till after the GP. We have 5 months to squabble over that argument.