On who is the 'real' world no. 2:
The whole 'Murray is only world no.2 because Fed skipped this and that, didn't do well in this and that' is silly. Murray also skipped Monte-Carlo and pulled out of Rome, after winning his first match, to rest before the FO. But if your argument is that Fed has been the second best player this year because of his best level of play, 2 slam finals, wins over Novak etc, then I would agree. On the other hand, both Andy and Roger had one win each over Novak that mattered: Andy in Montreal and Roger in Cinci. Both of them haven't been able to beat Novak in a big match this year except for on one occasion, in a Masters event, and neither have done it in a slam. And Andy has 2 Masters wins to Roger's 1. But Roger made 2 slam finals to Andy's 1. Really, they've both been competing for the scraps left by Novak, little to choose between them. As others have said, Stan has had the second best year.
But ranking doesn't measure peak form or performances in the biggest events, it measures consistency, which is a very different thing. That's why I've never been very interested in rankings as a determiner of greatness in any way. They're just a device to decide seedings for tournaments as far as I'm concerned. And if you want to do the 'Fed's the real no.2 because of his level and performances in the big events' thing, then this kind of thing happens all the time. According to this logic, which I agree with, then Murray was the 'real' world no.1 after WD 13, because he'd won two of the 4 majors and Olympic Gold over a 12 month period, whereas Novak had won only one slam in that same 12 month period.
That's why rankings aren't really very important in factoring greatness, IMO. It's about winning the big titles.