There aren't any holes to pokes. I also think that the lack of LE warning the public is either because they confidently suspect someone or flat out know who he is, especially after the April PC when they said the killer is local.
I know local LE mentioned early on that they believe the community is smart enough to realize how to act but that was when they were thinking along the lines of killer being an outsider and going nationwide with billboards and such.
It just seems to me that after that April PC, if the LE thought the killer was a local but unknown to them, they would have cautioned the community, at the least the women and girls about hiking trails alone or in small numbers. Since none of that language was spoken at the April PC, when they changed strategy and sketch, I think either LE is closely watching someone or/and LE knows the motive and doesn't feel they need to warning the general public. Maybe because the motive was particular to one of the girls?
Do I think it's possible the Delphi killer will kill again, yes it's possible. The cues I'm picking up from LE though make me feel that they won't let this individual have the chance. I could be totally wrong but that PC sent shivers through me and I real thought, they know who did this.
Like you said though, the longer it goes the less confident I feel and doubts start to grow. Have to have faith in LE and pray the guilty is/are caught.