I'm actually wondering now if they may have also found evidence on the north side of Lake Hodges that has added to what's leading them to be sure he's connected.
Something changed, and I feel it was more than just another missing teen here and the possibility of them being linked, that suddenly jump started the investigation into Amber basically that same day that Chelsea was found.
Given that Amber had to have been transported, whether alive or dead, and Chelsea basically did not, I could see him having had something, intentionally or not, somewhere that remained, and then realized the net was likely closing in since they were heavily searching where Chelsea was ultimately found, and so scrambled to dispose of something...and that that ultimately furthered them pursuing finding Amber, and then the renewed searches.
I don't know...but just a thought.
Most of the legal talking heads are in agreement that there was likely no plea yet, and that JAG directly giving them info would have come Sunday or Monday, or at the very latest, early Tuesday before he met with his then appointed lawyer prior to the arraignment.
If they found something by the lake, maybe their line of questioning would have allowed him to slip enough to know where to focus their search, and then that made pieces of information gathered from his home, computer, whatever help lead them to that exact spot.