This is probably the best strategy Westerfield and his attorneys and come up with. If they can get the idea out there that the Van Dam's were partying with other people that night, then one of these folks could have been the perp. Somebody else or the Van Dams may have then gone on to frame `the wierdo down the street'.
Remember, all Westerfield and co. have to do is establish a reasonable doubt to avoid a conviction. It worked well enough for OJ with that ``Colombian necktie'' bit. If they can do this using the media before the trial, then the DA's office may be willing to accept a manslaughter plea or something.
Maybe they have Sidney Blumenthal's conspiracy flowchart. You know, start with Rick Roberts or Art Bell or whoever, and then begin moving up the media foodchain. Eventually a legitimate source like Drudge gets his mitts on it, and then it's open season.
Now, the police have already checked everyone that had been in the house that night, as well as the van Dams (we don't know everything that the police knows) and at this time , they are not suspects.
One last thing, Westerfield's lawyer wil, also need to explain away why DW didn't simply call the cops when he found Danielle's body. Before the blood got on his shirt, before his fingerprints got on her.
That is what reasonable people do when they find a dead body, they call the police and do not touch anything.
Westerfield acted like a guilty party acts, he dumped the body and tried to clean-up.
He's fried.