I think what DM told LE she saw (the black clad figure) is figuratively in LE/the prosecution's rear view mirror, and the evidence they have gathered since that time, regardless of the level of piggybacking on what she said, blows away any and all quandaries about DM's state of mind.
I don't think it matters what she had for dinner, had to drink, or if she got high that night. It was the middle of the night, she was sleeping, and she was woken up by noises that caused her to open her bedroom door several times and basically tell her housemates their partying was too loud and she was trying to sleep.
Besides, it wasn't just her statement that was the only initial "lead" for LE to follow that led to BK. There was another lead on the white sedan seen on video in their neighborhood that night around the time of the murders, and he owns one (with no front license plate PA-style) and Pullman PD saw it outside his apartment, and one thing led to another. Per the PCA:
"The combination of D.M.'s statements to law enforcement, reviews of forensic downloads of records from B.F. and D.M.'s phone, and video of a suspect video [I think this is a typo and s/b sic "vehicle"] as described below leads investigators to believe the homicides occurred between 4:00 a.m. and 4:25 am."
I'll leave the bushy eyebrows descriptor off to the side because I don't think it was that critical in LE saying "hey, could this be the guy driving a white sedan in their neighborhood that night/early am". When LE looked up his vehicle license plate and then who it was registered to and looked at his driver's license, they discovered he is a white male, with approximate height and weight fitting within the parameters DM described, and his address put him living within 15 minutes of the crime scene. That would be a great big hhhhmmmmmm to me if I were the LEO who first looked him up.
As far as whether the man clad in black "saw her" looking out her bedroom door when she "saw him", I have always been certain he did see her and did know she was there -- how could he not have heard her yelling for them to be quiet and known she was there -- of course he did, imo.
And he could tell by what she said when she called out to them to be quiet that she didn't realize what was happening, so he deemed her not a risk to interfering or calling 911 because she had clearly misunderstood the situation, to his great advantage. Also, I think he had done what he came there to do at that point, and neither DM or BF were of interest to him, so he walked on by her and out the door, as per the PCA:
"The male walked towards the back sliding glass door. D.M. locked herself in room after seeing the male. D.M. did not state that she recognized the male. This leads investigators to believe that the murderer left the scene.".
All MOO
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