The link mentions that the sheriff's investigators were tight lipped but wanted to draw attention away from some theories.
Also:
"Hill said sheriff's investigators were likely reluctant to release more information because some details could cause speculation that could hurt the investigation progress."
http://www.azcentral.com/story/news...ssing-maricopa-couple-week-two-abrk/29483985/
What speculation could hurt the progress?
To know the truth about something would cause speculation that could hurt the progress?
Well I guess there's reason to this old adage: The Truth Hurts.
IMOO.