And investigators took lots and lots of pictures. I'm sure the jury will not be the least bit confused, plus the jury will hear the whole story, once again (in yet other words, as humans rarely utter exactly the same thing twice), when an investigator takes the stand.
Pictures are worth a lot. Ordinary operating procedure (and common sense) to thoroughly photograph the crime scene before moving anything, and to move things with a photographer immediately taking pictures. There's no other way to treat a crime scene, and it's just so basic to do it that way.
I figure the latent footprint would not even have been mentioned in the PCA (as one in a necessary series of bloody footprints), were it not for its support of DM's statements.
The total sum of what we know about this case is almost nothing, really. But we do know where they found the knife. And one person being slightly more specific in their language is completely normal and I'd be suspicious of the reports if the language wasn't individual.
IMO.