Just doing some pondering here but haven't several arsonists been firefighters?
Also after reading this again It is strange that all those volunteers missed the body on that Saturday.
From article:Nothing turned up for nearly a month. But on Wednesday afternoon, a hunch led volunteers to the area where Danielle's body was found.
Volunteers had first checked the site Saturday and found nothing. Ten volunteers returned after investigators decided the area needed to be checked again. Searchers found the body about 25 feet from the road under a cluster of oak trees across from a sand mine.
The remote road about 25 miles east of San Diego was one Westerfield might have taken the weekend Danielle disappeared, said Bill Garcia, a private detective who coordinated searches in the area.