I think that the most telling statement made by Superintendent Doug Carter was "We believe you are hiding in plain sight. For more than two years, you never thought we’d shift gears to a different investigative strategy, but we have."
My "take" on this is that L.E. somehow came to the realization that the perpetrator has been in L.E.'s midst, whether around the searches or has been interviewed.
I think that "Hiding in plain sight" could mean that they believe he flew under their radar. But not anymore. They are "beginning" to look at individuals who would have looked suspicious then but the person(s) was/were not the "suspicious-type".
The fact that the L.E. believes the perpetrator is from Delphi is intriguing.
Sounds like they are scrutinizing a few individuals (maybe even just one!) who they would never have considered them to be a suspect. But now they are focused on him/them.
It could even have been someone who gave them misleading information. Someone who is from the community and is well-known to them as an upstanding citizen.
It could very well have been a family member of the perpetrator.
Something or someone led the police to this "realization". Hopefully we will soon find out what it was!
May this week be the week!