That's why I said IF it's still available at 7 months. And by available at 7 months I don't mean 7 months out at 8AM. I mean like it's been a day or so and
ALL of your days are still there. Presumably, anybody who actually wanted your reservation by then should have already booked it.
Cancelling after the fact just and re-booking gives you more flexibility, say for example you book a VGF studio and it's magically still there at 7 months. All of your dates are available. Cancel it and re-book with the same points. Find out down the road your Aulani trip is cancelled and you're not going in the near future

. Since you cancelled when it was still fully available at 7 months, you can now swap it with your Aulani points and spare some VGF points that you may use next year. Compare this to if you try doing this 3 months out, you and I both know that studio is getting snatched up and now you're stuck with Aulani points that you can't use on a WDW trip until 7 months.