Hmmmm. I will have to cogitate on that. Interesting thought there. Initial impression: that's a possibility, IF Westerfield killed Danielle. Why? They may have heard rumors that Westerfield was into children or had other deviant behaviors. The neighborhood may not have wanted "his kind" there and told him why. Maybe that's why he killed Danielle.
If he didn't kill her, then that would better explain why there was child porn still left on his computer.....he had no knowledge about anything, until he was already gone in the motorhome and discovered the body.
If he didn't kill her, he should have passed the lie detector test. He failed.