I own weeks so I'm not sure how points work. I can tell you that, in my opinion, the trading power for the weeks unit was greatly inflated. For example, I can get 3 weeks in a 2BR at Wyndham Bonnet Creek and don't have enough trading power for a 2BR at WDW any more. I hadn't had a problem the past two years. And, that's with a week in Hawaii.
You can use the discounted RCI rate at any time. I found it much cheaper to rent points from a
DVC member.
Good luck.