I had the same issue as one of the five original people in our party decided last-minute not to come and we couldn't get her off of showing up on the party list on the ROTR BG page--even though we'd called to individually remove her from every dining reservation, parkpass/res, park ticket, and the resort. I called and was told it's because of the MagicBands! She was still actively linked to her band (and had previously been in our group w/ all our bands linked together) so would continue to show up there. The Castmember was reluctant to kill her MagicBand connection but I kept repeating that we couldn't have her name showing up on the ROTR list or we'd never get a BP--so she finally removed her. When we practiced the next day, she was finally gone, and was also not listed there on the day we were in the park--the other 4 ppl in our group were all preselected so we were all set. I'm so glad I called and insisted she be removed or we wouldn't have gotten on the ride! The next time we go to Disney we assume this 5th person will be back with us so the CM said we'll have to call back to have her re-added and will have to order her a new MagicBand--worth it to me to get that BP! : )