I hadn't realised that there was an original list. But beyond that, wirh Harry's form there should be no place for "incumbent"s unless they are simply thought to be still the best pairing.
Delighted though I am to see Billy selected for the DC team, I was hoping that this would be the week that he could finally break that Top 100 with a decent challenger run in Guangzhou where he would have been the 3rd seed. Currently at 101 in the live rankings, he does have 16 points dropping off on Monday, although 12 of those will be replaced by the upgrade of a non-counter. He has a lot of points coming off in October so now may be his best chance to break that barrier. Maybe with others dropping more points, he might sneak in anyway.