Just like to reiterate the time frame for a possible staging before, during and after the attack:
The alarm at the Sievers house was disarmed at 6:09am on that Sunday morning. At 6:17am a quick search was generated via GPS for Bonita Beach. At 9:28am a route was created to Bonita Beach, 9:41am search for Walmart. At 11:06am JR and CWW are spotted in Walmart, 11:57am checkout, 11:58am walking out of Walmart, 12:04pm leaving parking lot. 12:04pm searches for Lee County Rest Area, Boca Grande, Sanibel and Fort Myers. 6:54pm quick search for For Myers Beach, then nothing anymore until 12:44am for quick search Hillsboro Rest Area from the vicinity of the Peace River Bridge in Port Charlotte.
So the staging would have to occur between 6:09am and 6:17am or anytime prior to BS's arrival at the hose at app. 7:45am. At 8:01am the alarm is armed again by BS until 4:00pm, when she returns to the house and is unable to re-arm the alarm leaving app 10-15 minutes after 4:00pm.
So theoretically we have another time frame between the hours of app. 4:15pm and prior to TS's arrival home that night at around 11:19pm.
However, it is improbable IMO that CWW and JR would have approached the house during afternoon hours, due to the risk of being seen and due to their local travels documented by the GPS system. So they possibly entered some when after sunset/dark.
After 11:19pm, CWW and JR would have an app 35 minute time window including the time for the attack to finish up and be on their way to Port Charlotte/ Peace River Bridge, which is an app 50min drive(mapquest), so they can be at the approximate location at 12:44am as shown by the GPS.
-Nin