The other part of having two UY’s (since they are different member #'s) is that you can not combine points for a single point stay without transferring between the two (and that would count as your one transfer per UY for each contract).
For example, since you own SSR and BLT with Dec UY, at 7 months, you can combine all the points and book. However, if you owned, say 60 BCV points and needed 64 points for 2 nights. At 7 months, you can’t just use 4 of your SSR or BLT points–you have to transfer them. Or, you have to book one night with the BCV points (32) and use SSR or BLT points for the other night and link the reservations.
Not that it is impossible, but it does take some extra planning.