Do you still believe this? That the call to JM by JB was supposed to be before JB called the Police?
It's a difficult one to pin down.
The simple fact is that no matter which way you swing it, JB was on the phone to the police between 3:26 and 3:37 (give or take a minute either way).
So the call from JB to JM must have been either before 3:26 or after 3:37.
Based on the arrival of JB at the scene of the murders at around 3:48, it would seem unlikely that he would have had the time to call JM after his call to the police and then and drive slowly to the whf.
It would therefore seem most likely that JB's call took place before he called the police at 3:26.