Sorry I missed your comment before. I'll answer your question a bit different than you phrased it. The CC&Rs for every resort I have seen only allow reservation at 13 months for two weeks
at that particular resort. There is no reference to any other resort, any affiliated resort, etc.
We all here know that the idea that MVC TSs are just one big happy "Marriott" family is not real. Each resort is its own autonomous TS condo resort development with an HOA and governing docs (CC&Rs), who has a contract with MVC to manage the resort. They exist and act independently as HOAs.
Reading the definitions of an "Owner," "Timeshare Interest," "Timeshare Condominium" etc., it cannot be plausibly read to allow weeks owned at other HOAs be combined to qualify for 13 month reservations.
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No, CC&Rs cannot be changed easily like rules. They are like the constitution of the HOA, and these specific reservation procedures are set forth therein. Notwithstanding the above, MVC has consistently and continually since I have owned, allowed such cross-owner reservations at 13 months.