They, no doubt knew what BR had done. No doubt, they consulted with BR. No doubt, at some point before most of the staging, Burke was told to go to his room and stay there. No doubt, he came down unexpectedly during the 911 call. He then was ordered back to bed and was told to stay there until John came and got him.
MO
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But again, BR never told them before they stumbled on the body. That is a huge flaw in BDI, and goes against every paternal instinct every human being would have in a similar situation.