once Daytona PD eliminates positively O.P. by dna results, the next narrative seems to focus on the brother of the junkyard guy--once we eliminate that, we can then settle to focusing on the middle of the activity area, Holly Hill--The weapon used is something that the average shooter doesn't own, and the one who does, doesn't not shoot it regularly. So perhaps run down them memberships logs of the shooting range near where two bodies were found( Green/Gage)