I did notice this odd seasonal distribution in our decision to buy... That almost all of the Fall dates are in Adventure-Choice but the Spring dates are in Dream-Magic.
The key dynamic here is whether rooms are going unbooked in the spring. With the Sun-Thurs taken, nobody wants a 2-day Fri-Sat trip that costs way more. So I could see that leaving lots of Fri-Sats untaken. But I just don't see that May is going unbooked. And like you said, we can't really check that now... Perhaps in the spring, around Feb-Mar, see what availability there is for Apr-May.
Again you'd have to know if May is truly going unbooked. Between SWW and F&G Festival, May has traditionally been a really popular time.
February is another story. Feb falling in Dream-Magic doesn't make much sense to me. So how do we know if Feb rooms are empty? It could be that if you own at other vac clubs, ppl are transferring in to take these for cheaper?
So here's a question... you'd think based on this dynamic, that the UY of the contract would drive the cost of resale points. Since it costs fewer points to travel in the fall, you'd think UY's that give you good fall options would sell for more per point. Does that happen? I don't know if there is data on this. But you'd think then too, that Jan UY's (which are bad for trips Sep-Dec, the time when points are cheapest) would be cheaper because you'll generally need more points to travel in the spring / summer.