I really doubt that the Divi situation is at all related to the Sapphire one, or the Caravanserai situation. Resorts change their affiliation, some to both RCI and II and some do one or the other or neither. I have seen some add RCI or II so it is no surprise that they stop the affiliation and I am sure there is a cost associated for the resort. There are a lot of timeshare resorts on SXM, there will be a lot of changes to exchange memberships over the years.

As for Sapphire, it would just be speculation on why they have decided to no longer deal with RCI or possibly they did not comply with RCI. Speculating is not fair to either party.

Good luck, hope you find a better place for the others.
Todd