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They're not saying if this one was wearing a sneaker like the others... which kind of makes me think they may have found a matching foot (one that appears, initially, anyway, to match in size and shoe style), but don't want to say anything just in case it turns out to be false. If it was in a sneaker very obviously unlike the others, it seems they would have just said that it was also in a sneaker, but doesn't look like a match... or that it wasn't in a sneaker, if it wasn't. But who knows? I can't quite figure why they would hold that info back unless they are now starting to think of it as a crime scenario, and I was mostly under the impression that this wasn't likely.
I've always thought plane or boat wreck (bodies entangled with wreckage) + sneakers float better (more likely to be carried along by current).
My best explanation for why this keeps happening is not terribly nefarious. I think that some morgue-funeral home assistant is surreptitiously removing feet before placing the body in the coffin for the final viewing. Our joker then holds on to the feet for a period of months, then launches them into the water to be found. Presto chango, you have yourself a mystery, and the prankster just laughs and laughs...
I'd like to believe it's something like that, msali. The other alternative is that all these people have been killed or, less probably, dismembered and held captive by some psychopath. At least your explanation doesn't involve any suffering for anyone.
I don't think very many people are buried in their sneakers, though. So if we could only find ourselves a morgue assistant who's buying an unusual number of sneakers in different sizes...