Hi Adam. In a previous post you suggested that Sheila was led into the main bedroom to be killed? Is this plausible? Tests showed she wasn't drugged. Would she really not have fought for her life? Besides,if JB had killed her prior to his telephone call to police,can you perhaps explain to us why she was not found to be in a state of rigor mortis when discovered by EP (the other victims were) and also the fact that the first officers on the scene stated that Sheila had blood running from the corners of her mouth? Does this not suggest to you that she died much much later than the other victims,at a time when JB couldn't possibly have been present?
If Sheila was asleep, Jeremy, may have woken her up & told her she needed to go into the main bedroom. Sheila would have trusted her brother. Once in the bedroom Jeremy could have pushed her to the floor, held her down & shot her. That would only take a few seconds to do. Sheila would not be expecting this to happen & may have also been half asleep.
Answered the other bits earlier.