Far, far too high on any crime at all relevant to this case. Westerfield's biggest mistake was having anything ever at all to do with the Van Dams. He should have never opened the door for them with the GS cookie sales, he should have never gone to Dad's Cafe once he knew they hung out there. He should have even considered moving out of the neighborhood they live in.
But as to his having anything to do with a crime on the facts so far presented, he is no more likely than any other neighbor in a six block radius, at least.
From Day One, the Van Dams have been lying, their stories are all over the place. They say Danielle went out the door at night in her pajamas: is this likely? They would not release the "chip" from their security system; they claimed it indicated insecurity or even entry, then they saw doors ajar, is any of that likely?
Far more likely she was already gone Friday afternoon, or left her home to play outside only Saturday morning at 8 or so.
All this crap about the dog bleeding, about the dog eating its bed, about the dog not letting Damon sleep; about Damon's going to bed at 10 with the kids asleep, but...was he out playing PAINTBALL, and if so with whom, and when did he return; or was he just out having sex somewhere and didn't get back till 5 or 6 am; why all of this?
Was Brenda plotting to run away with Danielle and leave Damon, and the latter found out about it and took it out on Danielle?
All of this seems to need to be looked at in deciding on the inside-job hypothesis.
Much more work also needs to be done as to whether any stranger vehicle was seen lurking about Sabre Springs that Thur-Fri-Sat; or even earlier or later, was Avila or his ilk, or any unexplained stranger at all, cruising the neighborhood?