Marshall wrote:
2. If DF saw Z immediately after the Stine shooting, as Z confirms in his letter, then why would X go out walking his dog immediately afterwards? Wouldn't he be concerned DF would get a second look at him and ask why he was there earlier, wearing different clothing, without the dog?
Fair point, I'd say.
But there are some possible, if not counterpoints then at least semi-counterpoints, to be mentioned:
We don't know precisely what happened on the night. We don't know who appeared where, and was seen by whom, in exact detail. This general problem becomes more particularly acute if we're considering Mr X as a possible suspect (because he would have been heading home, right in the middle of his own neighborhood, if he was Z).
Let's say Mr X – as Z – comes walking down Jackson Street, and is passed (possibly even talked to) by Don Fouke. What's his conclusion? That he's safe. The cops clearly don't think he has anything to do with this. He moves on, goes home, removes his wind breaker and whatnot – and goes back out. Why? Because it's a kick. He wants to see the events unfold, he wants to involve himself in the action, like an arsonist who hangs around watching the fire he's started.
He takes his dog for a walk. Mr X told Mike that he had hardly ever walked a dog in his life, which seems exceedingly odd given the fact that he owned several dogs and that one of them is even mentioned as a particular favorite of his in a newspaper article (correct me if I'm wrong about the details here, I'm going by memory).
He is then accosted by Pelissetti, as he makes his way east on Jackson, and possibly south on Maple (Pelissetti's accounts of what happened that night are confusing, not to say contradictory). Well, Pelissetti, like Fouke before him, sees nothing suspicious about him, other than actually (unlike Fouke) recognizing him (as Mr X, the well known business man).
If Z was X, the fact that he ventured out again isn't a deal breaker, at any rate. He had already been seen – and possibly accosted – by the cops. He didn't know anything about the NMA/WMA mix-up.
Pelissetti claims that Fouke never encountered Z. Why's that? Trying to cover for his fellow officer? Or something else? Pelissetti encountered Mr X on the night – a fact he has divulged. What if he was sure the man Fouke saw was Mr X? What would he say then? He wouldn't say, on camera, that Fouke saw Mr X – because the latter is a big shot, one whom Pelissetti over the years has come to know better than he did at the time of Stine's murder.
So, Pelissetti won't mention him by name on camera, because dragging his name into this thing clearly isn't wise no matter how you look at it. He's happy to say, though, that he doesn't think Fouke actually encountered Z. Because that's what Pelissetti thinks: Fouke didn't. It was Mr X he rolled past, he was out and about at the time in question, and he obviously didn't have anything to do with the Stine murder.
Possible chain of events?
Yes, I suppose. But then again, even if the above is true, it doesn't mean Mr X is Z. It could be that Pelissetti's encounter with Mr X is the reason for his comment (about Fouke not having encountered Z), but nothing more. He, Pelissetti, did meet X (that is a fact). And he assumed Fouke had done so too (X being the only person around, and we're talking about a limited time frame).