Madeleine,
You are correct in your definition of opportunity. However, it has not yet been established conclusively by evidence that the crime occurred before 7 AM......That is the rub ....
The medical forensics and the forensic bug guy posit that death occurred between 1 AM and 11 AM on the day in question. SO BC had the opportunity before 7 AM, and zilch opportunity after 7 AM.
The 6:40 phone call is a "reasonable doubt" hurtle that the Pros have not yet overcome by direct evidence. IE they have not yet proved the call was spoofed. It could have, may have, might have, is not good enough, IMHO
Also the Pros has to explain a crime of murder, without a crime scene, and without proof of a body being transported in one of the two vehicles available to BC. If he did it, he should get a gold medal for cleaning up crime scenes. He could be a real resource to other dirtbags in the big house.
In any event those are two big hurtles that the jury either has to ignore, or give more credence to other elements like the google search.
Make no mistake about it, so far this case is not a slam dunk for the state.
BC has either gotten very lucky (with stuff that tends to mitigate his guilt), or very unlucky (cause if he's innocent he sure painted himself into a corner with the custody deposition and his own stupid statements/actions).
Just IMHO