This is what one Abdul Fattah, apparently a former leader of the Egyptian Islamic Jihad, says. And I don't see any reason to argue with the man. After all, what could be more fishy than a burial at sea? A dinner at Legal Sea Foods?
As for the body being cut into multiple pieces, this is easily explained too. President (or, rather, ex-president) Bush should be blamed*, no doubts about it. It is known that Bush has that habit of landing suddenly on aircraft carriers:
And what is easier than to hide a surgeon's saw in one of these pouches?
So there, the mystery is explained, nothing to see here, move on, people.
(*) I gather it's still the going fashion in D.C.