That could very well be, but this is my thought.He use Deet to burn her feet.Deet is highly flammable.
Where they found Gasoline traces in her hair piece, and on her clothing, I doubt he used both Deet and Gas. I would think if he used Deet to burn her, they would have found traces on her face and hands as well as her feet.
I think she applied the Deet before she left the house, because the tics are so heavy around central mass. If she was using the Deet for mosquitos I think they would have found it on more places higher up on her body as well. I will guess she applied it to her socks.
I don't believe there was a secondary crime scene.
If you read the article Trooper Par wrote that in as "Preliminary Observation" meaning he wrote that before the investigation was complete or at the very beginning.
If you follow the timeline, along with the witness statements, his vehicle was parked on BSR at 12:45 through 2:05. Her phone pinged at the same area at 2:12 at the time it was "powered down". If she left home between 1:00 and 1:15, and his SUV is parked 1/2 mile away, that means he had her in his SUV for almost an hour sitting on the side of BSR, powered down her phone, then drove the 5 miles to the gas station, bought the gas with her in the SUV, assaulted her, killed her someplace else, then brought her back to the same place her abducted her. As has been discussed many times , with all of the places in Princeton to dump a body, to me anyway, it doesn't make sense he would have returned so close to her home to burn her.
I may be wrong, but I thing Trooper Par wrote that before they put the timelines together with the witness statements.
We now know he drove back south on BSR to Wachusett St. to Main St. Rutland to buy the gas. He would not have bought the gas on his way back to Worcester, because it's not along the way.
I think he drove to Rutland, bought the gas, drove back to BSR, and burned her. Nobody saw his SUV parked there during that time frame.
Now the question is.... Where did he come up the gas can? Was it inside the SUV? Why would he have an empty gas can inside a closed up SUV on an 87+ degree day? I would think empty or not, the fumes would have been strong riding around with that can for no reason.
Did he put the gas can in the SUV with the intention of burning her before hand? If so, why didn't he put some gas in it before he got to BSR, unless he wasn't sure he would see her that day.
No traces of gas in the SUV by LE. Was he that careful not to spill one drop from the can onto the carpet in the rear of the SUV, or did he get rid of the carpet after?
Even if he got rid of the can in the woods and LE never found it (which I doubt), you would think some residue of gas would have been on the carpet after he put gas in it at the gas station. Even if he didn't spill any, just setting the can down to add the gas at the gas station, I would think would leave a small trace that forensics would catch.
Edit:
Just to add. Is AO a smoker? If not, how did he light the fire?
There was no mention of a lighter bought with the credit card.