Extremely hard to get past a few key facts:

1. Chad and Lori were having an affair
2. Chad and Lori wanted money
3. The four deaths both eliminated obstacles to the affair and were intended to generate money
4. Chad and Lori did not act the way innocent people do when children go missing (report them missing, search, mourn, etc.)
5. The children's remains are found buried in shallow graves on Chad's property
6. Chad tells his daughter Emma at the time of his arrest and as police are exhuming the children's remains from his property "I am not coming back"

There is not much room for reasonable doubt given these facts alone. Add in everything else (the geolocation evidence, Chad and Lori chilling on the beach in Hawaii while the children are unaccounted for, the racoon/limbs message, the wind direction search, the bizarre death number/casting/dark spirit/zombie stuff, etc., etc.) and the case seems like a slam dunk to me.

I'd even say that Chad's defense, especially his weirdly robotic kids displaying virtually no warmth for their mother or sorrow over her death, actually helped the prosecution.