No. But I can state with reasonable certainty that he's had a positive influence on results based on 8 seasons both with and without.
I can't compare whether Jason Lee would have outscored RVP playing in the same side as him.
You can't.
Stats can say anything you want them to. Joe Allen was recently found to be statistically Liverpool's most important player this season in terms of results, but you'd have to be a downright moron to actually believe that's the case.