That's a pretty tight timeframe. DA and JG were communicating between 12-3 am, but JG was also in the area during that period of time. Then after 3am he's out of the area. But was the white van at the restaurant from 2:30-4:30 or did that notice it at some point during that timeframe? The pan of oil still doesn't fit. I noticed someone mentioned restaurant deep fryers not catching fire, but I'm pretty sure they are built so oil splatters don't come in direct contact to the heat source. They are also set to a specific temperature, rather than just turning it on as high as it can go.
I wonder if DA getting ready to leave or a phone woke the baby? My kids always think they are being quiet, but it sounds like a herd of elephants. In a mobile home, there isn't much in the way of sound insulation between rooms. Even something like laying down a cell phone on the counter or opening a closer/dresser/door would be hard to hide. I don't think JG ever came into the house that night.
Regarding the cell phone, I'm not sure I could even guess what the logic behind tossing it was. I do know that there are ways around a locked phone, so maybe JG thought someone would find it, see some easy cash, do whatever needs to be done to factory reset it, and then sell it for a quick profit. If someone not so honest would have found it, I don't think JG would be sitting in jail right now.