It's clear that the executives of DVD, DVC, DVCMC, and BVTC all use their "separate" companies to the benefit of the Disney enterprise as a whole. In this way, BVTC accepted Riviera with substantially different rules for trading into Riviera based upon where the points the member is attempting to use came from and when (the post 2019 resale points restriction) and substantially different rules for trading to other resorts based upon where and when the points the member is attempting to use came from (resale Riv points can't be used outside of Riv, but direct points can). This, IMO, is the most compelling argument.
If a judge agreed that BVTC violated their own operating agreement, the judge could force Riv out of BVTC, or it could force Riv to change all of its agreements to that substantively similar to the original 14, which do not have these kinds of restrictions.
What I find more interesting, however, would be determining in discovery for this part of the suit how it was that BVTC, which is supposed to be arms length to DVD (since it contracts with DVCMC, not DVD) came to accept those restrictions? Which executives were involved? What does the paper trail say? I suspect we'll find that someone in BVTC raised the argument we're raising about dissimilar agreements, and was forced to go along with it because all of these entities are effectively part of one larger entity, and not independent enough to be allowed to disagree.