If doubles really mattered then all 3 of them would play it pretty often. And even if they did their results would have to be taken with a grain of salt simply because too much of the results would be dependent on how good their partners are.
How are you attacking me of all people? I could not have been more fair to him. What part of my 2015-16 assessment did you disagree with?
Did I not agree that he was injured in 2014 and it affected his 2015? Did I not agree that he hurt his wrist in 2016? What am I not taking at face value?
Recovery from knee surgery for Federer that forced him off tour for 6 months. For Novak it was elbow surgery that he delayed far longer than he should have but hoped to work through it. Pretty clear cut in both their cases.