There are times when a couple of resorts share buses.
For example, the CR and BLT share one bus stop, at times the bus may go to the Poly and/or the GF prior to going to a park, and they will share coming back from the park.
WL and VWL share a bus stop, at times that bus may go to the FW campground, it seems to me we stopped at the GF one time after leaving the WL but I am not quite sure about that.
The BCV and the BC share a bus stop, the BC also shares a bus with the YC and at times the BWI and the Swan and Dolphin.
The SSR has its own bus, but has about 5 bus stops within the resort.
OKW has it own bus and has a few bus stops within the resort but I am not sure how many.
I know you said that you were not interested in the AKL, but the bus for the AK stops at Kidani first, then goes to Jambo house and then onto the parks, it does not share with any other resort.