You are correct that a room with only unaccompanied minors staying in it should guarantee you a connecting room, yes.
However you can only have two rooms connecting, you do know that don't you? Not sure how you're going to fit ten people into two rooms (unless two of them are under 3 years old, or is this is a POR booking?). It's going to be fun anyway!
Andre
Yes we are booked at POR. They have one room under me and one under my husband as they won't allow you to book a room with unaccompanied minors (ruling out three room options anywhere and limiting us to por or some if the deluxes). Theoretically we could split up but that would really make things difficult for us (some if the kids have special needs) and not much of a vacation. We will be happy with whatever we get as long as there are connecting rooms!!!