I didn't see the link you posted earlier, but it might have been this one.
http://www.patc.com/weeklyarticles/dna-timeline.shtml
It's true that the actual processing of the sample can be completed within 2-3 days, and when a comparison is made to a known subject -- as in the case of AS and other deceased victims where a profile of the missing person is already available -- a match can be made rather quickly. Finding a match to an unknown subject normally takes much longer.
MissD pointed out an article in which LE states they do have the DNA profile, so I'll take it for granted that is true. I wouldn't make any assumptions based on failure to make an arrest, or to clear anyone, though. There are a couple of possibilities, and imo, either is likely to be true at this point.
Either the profile matches to a known suspect with DNA on file, but LE is holding off on an arrest while awaiting results from other evidence testing ("putting together a case").
Or, there is no known match for the DNA -- suspect is known, but has not submitted a sample; or, suspect is not on the radar, and thus, has not been questioned -- and LE is still seeking out the subject through various databases, while simultaneously utilizing other investigative procedures.
JMO
Scottsdale police released a statement that said in part:
"Today's homicide investigations depend heavily on forensic evidence and science. These investigations take time as scientific evaluation is applied to the collected evidence. This is very apparent in this investigation.
"Our detectives and crime scene specialists worked tirelessly for three days methodically and systematically collecting forensic evidence from inside the home. This evidence will dictate the focus and speed of the investigation.
http://www.kpho.com/story/28147254/police-investigating-scottsdale-womans-death-as-homicide