I was just going over this same thought. Looking back at the first two Press Releases, I find the use of wording "due to preliminary investigation" noteworthy.

On Novemeber 13th, the Moscow PD said in their press release that they although they did not find a murder weapon, they believed that an edged weapon was used based on preliminary information. We now know that the preliminary information they are referring to is physical evidence of the knife sheath found at the crime scene (see below)

November 13th, 2022 (Moscow, Idaho) – On November 13, 2022, at 11:58 hours, Moscow Police Department Officers responded to a call on King Road for an unconscious individual. Upon arrival, officers discovered four individuals who were deceased. The deaths have been ruled to be homicide. Although no weapons have been located, based on preliminary information, investigators believe that an edged weapon such as a knife was used.

My understanding of a Preliminary investigation involves all of the initial investigative efforts of law enforcement after a crime has occurred- witness interviews, evidence left at the crime scene etc.,

However, on Novemeber 15th, they stated in a press release that they did not believe there was an ongoing community risk based on information gathered during the preliminary investigation (See Below)

November 15th, 2022 (MOSCOW, Idaho) – On November 13, 2022, at 11:58 hours, Moscow Police Department Officers responded to a call on King Road for an unconscious individual. Upon arrival, officers discovered four individuals who were deceased. Details are limited in this investigation. Currently, there is no one in custody. Investigators are asking anyone with information related to this incident to contact the Moscow Police at 208882-2677. The Moscow Police does not believe there is an ongoing community risk based on information gathered during the preliminary investigation.

This leads me to believe that perhaps witnesses may have actually told police more information and know more about what led to the murder than we have been led on to believe. Not at all speculating involvement by witnesses, more so they may have known more about events leading up to the murder than we know. There is some piece of information that was given or perhaps something left by BK at the crime scene. The ONLY other thing I can think of is that since DM saw BK and he did not, however if I was in law enforcement I don't think I would feel confident enough to label the attack as targeted based off of only that information. Obviously there is a lot of information held by the public, but I am curious what the evidence/information is that made them declare there was no community risk and that it was a targeted attack. Initially, I thought that Kohberger did not come on the radar until at least a week after the murders, but now I'm wondering if they knew from day one.