Not sure, but I don't think that IN LE issued a super secret bulletin to LE across the country to be on the lookout for a guy with a hatchet.I am pretty sure that when DN was arrested the outstanding warrants popped up when his name was searched in NCIC.
I believe that DN being arrested in possession of a hatchet in CO does not translate into "DN killed the girls with a hatchet". At all.
Understood, but why would officers from the Indiana State Police associated with the Delphi murders go out to Colorado to talk with him, and do so almost the next day? If it was an outstanding warrants notification, you could expect a longer process and if the county that executed the warrants wanted him maybe county-level officials would be involved (Sheriff's Deputies), and there would be no press release. That makes me think the Indiana State Police had a by-name alert for this man.