I have to leave for a while, but I have been thinking all along that the perp intended to confuse LE by scattering evidence.
I think, for example, that he probably tazed Holly, leaving her able to walk after a few minutes. And I believe he carried her belongings himself, not her.
I also think LE has found at least several items connected with him that cannot be traced.
I do not think he has a criminal record and I don't think the blood on the scene was human at all.
He can get out of where he has Holly, but I believe he scattered the evidence before the full search even started. Probably in the timeframe it took for the brother to come downstairs, realize something was wrong and call 911.
All JMO and I think this points to the perp's intelligence.
To be blunt, he isn't Billy Bob Hillbilly.....he's educated.