Actually that scenario is not Guaranteed either... The only time that connecting is guaranteed is if it is one adult traveling with multiple children. If you have more than one adult it is still only a request. As the other poster stated CRO will tell you it will happen and it may be on the confirmation, but it is still a request if there is more than one adult... Now with that said the room assigners will make you priority they don't want to split you up, but when you book your room you are just booking a space, the room is not actually assigned at that time, they can not guarantee anything because they don't know what is going to be available.