I believe thst LE has accumulated a plethora of information, about this case.
That they have been connecting "the dots", to complete this puzzle. LE obviously only reveals info, that will not jeopardize their investigation. My gut feeling is that it has advanced, further than most people believe.
I will not be surprised, to whom this leads to. I worked in LE long enough, to not have tunnel vision, and keep open minded. There have been wide ranging opinions, as to the nature of the perp.
IMO, LE has sent out "mixed signals", since the inception of this investigation.
Probably not to telegraph, what knowledge they do have. Not to alert any POIS, they may have developed, for quite some time now.
I do go back to LE'S apparent view ...
That the public is not in any danger.
I have been giving this belief, a lot of thought.