I wonder if the LVPD had heard about SOME kind of confrontation between EN and BM ( the legally blind kid ), perhaps from EN himself, but there wasn't anything to it really, so decided not to follow up, and due to the murder charges didn't think it was important anyway. Then the LVDA sees all the huge holes in their case, the real credibility issues with KM and BM, so tell LVPD to look harder into this alleged knife incident, and lo and behold, now there's witnesses to fill in the previous missing info. IOW, Maybe there are some in the neighborhood who decided to either contact or accomodate LVPD in this instance, because it related to EN? Kinda like killing two birds with one stone or something like that. I think the family of BM, the legally blind kid who wasn't wearing his glasses are friends with the Meyerses'. IMO.
All very stinky and hinky, just like everything else in this case, IMO!