Maybe I'm just projecting, but when I go on a group trip, one of my main concerns is trying to do everything I can to prevent tension. I wouldn't foist a split stay upon family members who might not care as much about the Disney resorts. Nor would I force people to stay in a hotel they don't want (within reason, like staying at ASMu vs Poly would be different, but CR and Poly are comparable). I would either just give in on CR, or stay at Poly by yourself. As others have said, it's easy to get between the two.