We had a situation with the monorail, but it was a bit different than yours. We asked a CM if we could ride up front on the monorail. We were in the waiting area near the front of the train already. He said yes, and told us to wait in the assigned area just to the left of the front waiting area, while he went off to take care of something. The monorail hadn't arrived yet.
Apparently a few minutes later a different family asked another CM if they could ride up front. They had been waiting in one of the middle waiting areas. In other words, if they hadn't asked to ride up front, they would have boarded somewhere near the middle of the train. That CM told them they could ride up front and to walk over to the assigned waiting area that we were already waiting in.
When they saw us waiting in there, they told us we had to leave that area, that it was reserved for, quote, "VIP guests." I didn't know that they had asked a CM about riding in the front car, and responded that it wasn't for VIPs, but was where we were told to wait so we could ride in the front monorail car with the driver.
She got really indignant and told me I was "cheating" and that we couldn't be the up-front family because she had already gotten approval for it. I told her we had gotten permission from the CM five minutes previously and that I'm sure if she were willing to wait for the next monorail that she would get to ride up front as well. I didn't have the heart to tell her that she wouldn't be able to have all six people in her party up front even when her turn did come up. (We had five in our group and I already planned to separate from the rest of my family so they could ride up front. The limit is 4.)
Just about that time the train was pulling into the station, and the CM I had asked about riding up front approached us. The woman in the other group immediately wedged past me and started yelling to the CM that her group had permission to ride up front and that we had "skipped" her. I shook my head and shrugged my shoulders -- he and I both knew that I had already talked to him and that he had told us to wait there.
He told her that my group was first, as we had already gotten permission. He waved my family through into the front car, while I stepped into the first 'regular' car. Then he told the woman that if she wanted to wait for the next monorail, four in her group could ride up front. She started shouting at him that if she was going to wait around for another "damn monorail" that she "wasn't damn well going to separate her group," and that they would have to let all of them ride in the front car. He started to tell her that was not allowed, etc...
Meanwhile two kids in her group, about 10-11 years old, were clearly embarrassed by the whole thing. They stepped into the first regular car (the one I was in) and tried to tell the woman that they just wanted to go to Epcot, and to get on the monorail before it left. She wasn't paying any attention to them and then the monorail doors closed and we were off!
Yes, they ended up separated from their group with me on the monorail to Epcot. When we exited the monorail at the other end I found a CM immediately and told her that those two kids were separated from their group but that the rest of the group would probably be along on the next monorail. She told them to wait there with her. I have no idea what she had to say when she caught up with them but I'm glad I wasn't there to hear it.
David