If the last day(s) is missing but any days before (after or on the 11 month date) are available then this is not related to walking. Walking wouldn’t present itself of missing last days only, because continuous 7 nights can only be booked from 11 months forward. It presents itself as the front end missing only (even that is difficult for us to prove is walking related we only have anecdotal evidence to suggest it is). I’m sure
DVC has guesses as to what time walking is common but it’s something we won’t really ever get from them.
As of right now a stay in a standard studio at BLT for the nights of January 19, 2019 to January 25, 2019 (7th night that can be booked today) all nights except the 19th are available. Walking might be happening, but since only the 19th is missing if it is it’s not that common right now for that time, IMO.