Actually, I never really thought that Burke on the 911 call or not is significant. If it turned out he was and the R's said he was sleeping, that to me leads more to the intruder theory and the chaos of the morning. Johna and Patsy may have really been so hysterical and dumbfounded that they didnt really pay attention to the details. It could be they ran and checked Burke, he was asleep and they got back down to call the cops and he got up. Maybe in all the hysteria, they weren't sure what happened when.
I think the R's thought that the cops were there when they all discovered JonBonet, and they went over the details of the evening before several times that morning, they felt like they didnt have anything to add and when it became clear everyone thought they were involved, they did hide behind lawyers out of fear and not really knowing what else to do.
I think all of this now as time has passed and I have aged a bit. In the beginning I thought it was a sign of guilt.
Admittedly the RN is the strangest thing, but maybe it was a nut and its just that strange.