Walking is ineffective at 7 month window as owners can book at any time plus many days are unavailable so flipping a resie (walking) can't be done. Really only right at 11 months. For example, I am BWV owner and have been grabbing the days dropped by walkers for Oct (in stand view studios). I just look and see what days are open a few days into the 11 month window and grab 3-4 consecutive. Then I wait a few days and check again. I am aiming to get to around Halloween. But we are flexible empty nesters so I can take whatever I end up with (and actually DH doesn't want to go so we may cancel or rent). But there are random days missing so I cannot just walk/flip. I have to wait until days get dropped by the walkers. Like yesterday Oct 20, 21 and 22 were missing so I did Oct 17-20...then today I ws able to modify to Oct 18-22 as just Oct 22 was missing (I only want 3-4 nights anyway).
But my point is, by the time you get to 7 month window there will be random days missing so you cannot truly walk. Today you might be able to book June 22-26 but in a few days you may not be able to flip to June 26-30. As June 27 and 28 might be missing AND an owner can just book those dates now before that 7 month window opens. Maybe folks are doing what I am and just grabbing dates at 7 months but really wanting later dates but are flexible and just want to be sure to have something so they are grabbing and then later modifying if they can.