Not sure if this is the answer, but the right-hand (smaller) side as you face Lagunamar seems to be used primarily for rental traffic, while the larger (left) portion is primarily for owners & exchangers. As I recall from the January owners meeting the past 2 years, a bit more than 30% of the units at Lagunamar go to rental traffic, 60-some percent to owners and exchangers.
At one time there was a sign directing guests to the right, owners to the left....but that was more than 2 years ago.