When a resort unit is assigned a UY, that is fixed. Contracts are divisions of those units and cannot be changed to another UY. Looking at VGF, if you had a March UY, for example, the only units that will benefit you on the waitlist will be units 1I, 7B, and 8A. If DVD, Inc. reacquires a Unit 2E contract (by way of ROFR, or foreclosure), that would only benefit someone looking for an April UY, regardless of their spot on the waitlist.
Assuming that 2E contract had points available, those would be sold to the first person on the waitlist for April points. There's some speculation that Disney could draw on "cash points" to fill a contract, but I've come to believe that's unlikely.
Others can correct me if this is wrong, but DVD cannot combine two separate units (in this example, 1I, and 7B) to make one contract that can sell for those points. So if two 25 point 1Is come in, and a 50 point 7B comes in, they can offer you a 50 point contract from either 1I or 7B, a 25 point contract from either 1I or 7B, or two 50 point contracts totaling 100 points with two two closing costs, but they cannot offer you a single contract for the 100 points (or any amount above 50 points, for that matter).*
So regardless of how many re-acquisitions you see on the ROFR thread or on the OCC site, unless the unit matches up with your UY, the condo lease has the points available for DVD to sell, and you are the first in line for that month, you won't benefit.
So you can see why the wait listing for VGF and other older resorts are discouraged by the sales folks during a tour because the longer you sit on that waitlist, the longer you spend doing research and learning about other options outside of directly buying from DVD.
*Edited to clarify you would be offered two 50-point contracts