DB Washington, the point about shorter notice reservations is this:
Using OKW as an example, at the 8 to 11 month window, if you want to make a reservation at your home resort, you are only competing with other OKW owners for the units and times you desire. This is why you can almost always get what you want during the busy seasons, and have absolutely no problems at all during the low seasons.
Now let's say something came up and you find you can make a trip to WDW only 3-months from now. You'd like to make this 'shorter notice reservation'. However, now you are trying to book a room and timeframe, but you are in competition with ALL
DVC owners as you are now way under the 7-month booking window.
If you're looking for Adventure season, January or September, a 1-BR S-T stay at OKW is 16 pts/night. At BWV, VWL, and presumably BCV, it would be 22 pts/night. (BWV standard views would all be gone by then for sure). So the owners at BWV, VWL and BCV would look at 5-days at their home resort for 110 points, or 5-days at OKW for 80 points, and book at OKW to save points. Thus the owners at OKW will begin losing the opportunity to book at their home resort at less than 7-months more and more. This makes advance planning even more important, and makes it more difficult to get any accommodations at shorter notice. On the flip side, this then leaves more empty rooms at BWV, VWL, or BCV at short notice, so if you're willing to spend the extra points, there will probably be more opportunity for rooms at those resorts as their owners try to save points by staying at OKW.
Just like Rich, there are disclaimers: Many bought at BWV and VWL (and will buy at BCV) because they want to stay there and have no intention staying at OKW, or maybe at Bonnet Creek. But there are also many new buyers into DVC who want to be part of the program, but once they're in, will want to stretch their points as much as possible. This is what will make it more difficult for OKW owners to book into their home resort at shorter notices.
All IMHO.