For those who own at Poly or BLT (or both)

[DoubleBaconBLT]

They can only book a room at a fully declared/sold out resort (like BLT) for a welcome home stay if it available for all members to book with points. If it is being walked, them they would likely be unable to secure it for a welcome home stay.

The easier option would be to ask for them to pull something from the Poly tower undeclared inventory, Cabins undeclared inventory, LSL when it first opens, etc.

This is not true. They can book a Welcome Home stay for you using their cash room inventory. I have a stay in about a week at BWV that I booked in September as my Welcome Home stay. There were no rooms available at BWV on the DVC site at the time (my resale membership showed nothing available to book with points). The Member Services rep explained that for Welcome Home stays, they can book these cash rooms, but it's only for a direct member's first stay and only if you call Member Services to book.