Interesting that the first week of this thread and forum finds a shift at the world #1, if I am correct.
The Bryans lose 500 points from last year's Madrid, replacing them with 125 from this Madrid, dropping 375. Nestor has no ranking change, as the 125 and last year's 0 are both non-counting. Zimonjic gains 65 points, dropping off Doha. This should mean:
Bryan 1 5450
Bryan 2 5450
All 4 have 250 points dropping next week, with the Bryans and Nestor having the stronger non-countable by 65 over Zimonjic. The Bryans will not be in action, while Nestor/Zimonjic will attempt to take the Bryans' title from 2007 in Basel. A final or better would raise Nestor's margin, anything else will leave it the same. Zimonjic's margin to the Bryans will increase if he and Dan do not make the final.
The Bryans must defend a win in Paris, while Nestor/Zimonjic must defend only a final, a 150 point difference.
The Bryans and Zimonjic have no points to defend from the Masters Cup, while Dan must defend 650 from a 2-1 RR record and an overall Cup win.
All in all, it looks like it will be a close fight for year end #1, though if the Bryans can make the Shanghai final, they should retake the spot(s) by the end of the season, if they haven't after Paris.
I started to calculate the new projected points now, will continue later and update the posts later this afternoon. But it's true that Nestor has more points than the Bryans now after Madrid.