I mostly agree:
1. He believes that Casey got rid of the body before the 27th because she called Amy and told her she got rid of the smell in the car.
Question: that sounds like it would be a coded conversation telling someone (amy) that she got rid of the body? I don't remember reading of this conversation.. I haven't found Amy to be someone suspicious, but that is a suspicious comment for casey to make to her..?
2. The night of the 26th she parked the car at Amscott.
I think with the body in the trunk
3. The morning of the 27th she went back to Amscott got the car went to Mom's house and called JCP.
4. Then she spent 15 minutes at a location where they have telephone signals.
5. I think this is the location where Padilla believes the body was disposed of and the 15 minutes at the location was to check on it.
I think that she decided overnight that leaving the body in the car at Amscott had too many things that could go wrong. So she goes back and gets the car. She then either buries (I hate to say "dumps" but that's probably what she did
) the body and then goes home to her mom's to clean up and gets the food and popsicles, drops car off, waits for AL (this scenario explains the popsicles... I am sorry, but AL's answer on the popsicles makes no sense. If you are holding a box of popsicles that are melted, you'd toss them in the dumpster you are sitting next to, so there's no chance of a sticky popsicle leak, OR you bring them to AL's freezer, and they are misshapen (which AL would remember if he ate one, or remember if they never made it to the freezer.) OR she gets the car, goes home for whatever reason, then goes to bury the body before dropping the car off at amscott the second time, and waiting for AL to pick her up. I think the JCPenney call is irrelevant except that it shows her location for 15 minutes in a swamp or somewhere odd.
That was my interpretation.