If I am getting this right, someone who has a nomination from an MOC is put on a slate with 9 other people who have a nomination from that same MOC, and the candidate with the highest WCS is given the appointment?
The elected official can put up to 10 names on a slate for each appointment slot they have open. They can have up to 5 appointments to 1 SA charged to them spread over 4 classes. Most years, that means 1 slot is open, but occasionally 2, so there could be 2 slates.
The elected official has complete discretion over how they run their selection process, in terms of criteria, interview or not, etc. They can also choose to rank the slate or not, with a couple of different methods. If they use the principal nom method, the SA is expected to offer the appointment to that candidate, if fully qualified, regardless of WCS or how the SA compares them to others on the slate.
One of the fully qualified applicants (medical - DoDMERB, physical - CFA, academic plus all other evaluated factors) wil be offered the appointment charged to the official.
Fully qualified others on the slate may also be offered appointments by the SA; they wil be charged to other nomination authorities held and managed by the SA.
Where the appointments finally get charged can be fluid until the end, as the clas settles into its final form.