There are two stops at DD - Marketplace or Pleasure Island. The busses are fine to take from DD to Swan or any resort. That will be one place that will be a "transfer spot" for me between OKW and other resorts. So you will do fine!
Yes Glo, I will be dropping off the car the moment I get to WDW on thursday ( or sometime that day ) and pick it up again on sunday to go back to the airport , there's no need for me to keep it.