For each of those reasons the season would be different, but depends how. Kubica would probably lead the team more than Petrov, Heidfeld or Senna could, which would help with development and getting everything out of the car. That being said, I can’t see him achieving much more than the third places Vitaly and Nick achieved – they were too far behind Hamilton and Button respectively for Robert to be able to make the difference.
The upgrades didn’t work because the front exhausts made them very difficult to work, so of course it would help them – but it was very hard to make them work.
The Pirelli tyres hurt them as well. The Bridgestones tended to understeer and Pirellis had more front grip. Therefore downforce on the rear of the car was much more important than in 2010, and normal blown diffusers provided just that.