Yes, I do suspect that, hergus. MPD from the beginning could have said a little more than they told the public. Their posture was that "lives could be in danger", that "they were being very methodical", but when they take that position, they only made more interested people curious and suspicious.
Now, we're learning that they had tips that they should have followed up on. Any tip about that park or neighborhood should have had a thorough investigation, IMO. It should have been a priority. How "methodical" is that?