RSBM
IMO, police do not know whether there was one individual or multiple. So they don't jump to conclusions and state there was just one, or that there was more than one. They just keep an open mind.
Whereas the FBI profiler is guessing there was just one attacker based, IMO, on probability. Most often, in sex assault/ murder, one person acts alone (perhaps because they are deviant loners, rather than having a best friend who also wants to do it too). But again, that is not always the case, and might not be true, here.
In the Idaho university murders, 4 people were savagely murdered by a knife attack that lasted less than 20 mins (including the perp getting in and out of their car, and entering with no signs of forced entry). There was also a frantically barking dog and two other people inside the home. But no one reported anything.
In other cases, the killer has stayed in the home a leisurely amount of time: having a shower and doing laundry, rummaging drawers, even using the victim's computer.
"The community of Union Township was horrified at this case. The community was in fear," said Superior Court Judge Joseph Donohue
www.nj.com
There is probably more information about Audrey's case, that police have not released. But they must believe that releasing it wouldn't help solve the crime.
There is the famous story from Sherlock Holmes about the curious case of the dog in the night time, but that's about why the dog didn't bark.
I personally don't put a lot of credit into stories like the barking dog, or Audrey's premonition. IMO something innocuous can be imagined into relevance after a shocking crime like this.
If someone had gotten up to investigate why the dog was barking, and seen something, then it would be relevant.
JMO