EDIT: Actually, they did not take off for the house, but left the parking lot for "another location?". TBH, I would not trust the seconds and minutes here. You can see the 911 call minutes not adding up with the doorbell camera minutes, for example.I can't get over the fact that the perp took off for the house at exactly the same minute that Sergio leaves the house.
In general, I've been thinking about the "conceal on a different street" - this is vague and probably vague on purpose. I think it is highly likely that this new location provided them with an option to view the house. Probably manually (binoculars or similar), or maybe electronically (closer distance to their devices?) or via a third person (might they have had an accomplice, who was watching the house, that they communicated with?).
I personally think the attacker was waiting for SB to leave (either because it is clearly safer to attack Liz when she is home alone or maybe because SB would have recognized them) and during this waiting the car was positioned at a place that allowed them to discreetly monitor the car leaving from the driveway / turning a corner / passing an intersection or similar. Maybe LE knows where the car was during that time or maybe they only have a hunch but no solid proof, but in any case I feel like looking for this location might actually be the real reason for the night-time pass-by's.
In any case, the night-time pass-by's make me think that the person behind the crime was not local to Tomball. I mean why do it only the night before?
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