I wouldn't say there is "more evidence" of an intruder. in fact, we see with the Karr allegations, the things an intruder would have had to do inside that house to pull it off. not easy.
the parent's behavior in this case was, to say the least, strange; as are some of the anomalies in what they told police, Burke being on the 911 call tape, etc. if something did happen that night, the parents had total control of that house for hours. still, there are missing pieces in the case against a parent - motive being the #1 thing, why did it happen, what triggered it?
I'm not sure that the 911 tapes are what Steve Thomas claims them to be. Here is a link. You be the judge.
http://www.webbsleuths.org/dcforum/DCForumID37/561.html