Can only comment on the drivers i have seen this is the reason no Fangio etc.

Senna, Hakkinen, and Schumacher.

People say Schumacher wouldnt have won as many World Championships if Senna hadnt died. I feel the other way tbh, Senna wanted to move the Ferrari for 1995 and then retire at the end of 96. Senna would have made the car/Team like Schumacher did but 2 years earlier. Schumacher would have then got into a superb car straight away instead of having to build the team up etc.