Not sure if I'm clear on what you're asking exactly but I'll try and answer, the OKW busses are dedicated, meaning they don't make any other stops at any other resorts besides OKW. When picking up at DTD they will stop there and PI first before running back to OKW.
Once at the resort the busses stop in this progression, correct me if I'm wrong someone: Peninsular Rd, South Point, Turtle Pond, Millers, HH. There is not "one" dedicated bus that runs internally all the time, basically if you're at South Point and want to get to HH, jump on any bus (no matter what park it says it's going to) as the last stop is always HH before leaving the resort.
Hope this helps!