It's most compelling to me that RD's audio captured TS's car door, the car locking and the garage door being raised.
I'm curious to know how quickly the garage door closed after that.
As for the shadow, the best explanation I've heard was upthread, that the light disturbance was caused by the movement of the garage door itself. It occurs virtually simultaneously to TS's exit. Pop the button, pop the door. The garage donor's and hers, respectively.
RD's audio may well confirm that sequence.
I'm convinced that TS's abrupt exit from the vehicle has everything to do with the task before her. Having done what I believe she'd just done, now she had an enormous cleaning challenge ahead of her, and only one skinny hour.
Bet she got A LOT done that hour.
Then she sent LaiS to ride her binge sheet school, bought herself more time.
Then she sent HH and LaiS to the Dollar General, for more time.
Then HH to the park (no, not to look for Gannon, he was probably still "sleeping", but to keep HH and LaiS occupied and out of the house). More time.
Then she called LE. JMO but I bet it sounded something like this: "I'm calling because my stepson is late for dinner. He's 11. Yes, very forgetful, does this all the time. You know how boys are. I'm heading out now to check with friends and neighbors. You bet, I'll call back if I have trouble. He's probably at Quincy's."
She's a salad spinner.
The story I REALLY want to hear is the one she told HH. How did she explain that Gannon went from asleep to lost, right under TS's nose? I hope HH is singing. Just imagine the Tsplained, Tbrained tale TS manufactured for her. I imagine she saved the rape stories for later --
If words are a headache, whatever the version, that story will be a migraine.
JMO