I lean more toward Spartan86's view... i.e. tighter value-gap between loaded / stripped contracts. This is a buy for the long haul, so a few extra points now will be trivial in the grand scheme. For one, I'm not a fan of renting. Most owners are not thinking rent their points to people outside their family either. So I don't value extra points at their rental value. While you get that money, it is for going thru the hassle of finding a renter, getting paid, waiting out their stay, and enduring the costs that renter might incur. So it's not all profit -- you've had to work for that money. If you don't need or want 2016 points, then I would steer toward contracts that don't have them and take the savings up front rather than overbuy to rent out in order to make a deal financially sound.
Also people will get so many points over a life of owning
DVC that extras really are not that important. Once you buy in, you're going to take a LOT of trips. Way more than you're thinking now.
Missing 2016 or even 2017 points is fine, but the value of this depends on the time of year. A Dec contract missing 2017 points means no points till Dec 2018, which is a long time. That contract I would heavily discount. But a June contract missing 2017 points would be more tolerable and not discounted by the same amount.
So to me there is no fixed value. It's more subjective and depends on things like when your next vacation is planned. I would look at a Dec 2017 contract having upcoming 2017 points as good. If it had 2016 (Disney's "bonus" points) I would look at those as extra... and tho they are fully rentable, I would not pay $15 more for that contract up front. It would be considerably less than their rental value... Maybe $6-$9 more. If the seller doesn't want that, THEY can go rent them and deal with those hassles, not expect the buyer to pay full rental value without having to do the rental work. If they are truly worth that much, the seller should go do it. But... then the seller has to wait to sell their contract, wait out a renter, etc. See there are hidden costs there.
Net result is the loaded contracts do not value up like you might calculate based on rental value -- rather, the $ gap is smaller, by about half.