There's been lots of discussion here lately by several very intelligent, observant (and persistent) commenters focusing primarily on the 911 call and whether or not John wanted that call made. To save time and effort, I've decided to add a post summarizing my thoughts on this issue, and explaining, moreover, why I feel so sure John is the culprit and Patsy the innocent dupe.
If we focus only on the call per se, and neglect the overall context of the case as a whole, then admittedly it's hard to understand why Patsy would want to support John in a lie over who decided to make that call. Since my approach has been to concentrate primarily on the facts, I've emphasized that it was Patsy who called,
not John. And on the basis of that incontrovertible fact, I've concluded that, given the absurdity of the intruder theory, Patsy must be innocent and John guilty. My reasoning is summarized as follows: