Several problems. First, he takes the 1172 missing from a web page for the Civil Defense which says "not all persons on this list are missing, but at some point during the past few weeks, their status has been inquired about by family members or friends." The coroner in a Sun Herald article says there were 695 missing, and 594 have been identified. We saw this same process after 9-11, where people find friends or relatives and don't even remember reporting them as missing.
http://www.sunherald.com/mld/sunherald/12819355.htmSecond, he cites the coroner Hargrove as corroborating his story when the coroner has said there are not hundreds of missing, and certainly not hundreds or thousands more dead. The coroner claims he never believed there were. In fact, Marble uses Hargrove's quote about caskets, from cemetaries, to argue that Hargrove implied people were swept out to sea.
Third, all this "I heard from sources that the Coast Gaurd was finding bodies" is no different than the Freeper whose best friend's brother was a paramedic and reported thousands of dead bodies hanging in trees in Hancock County, or the blogger who reported that his brother's band's drummers--who he assures us is very reliable--reported that Slidell had been completely washed away and that there were hundreds of bodies floating in the lake. Neither story was even close to true.
Fourth, he goes out to Cat Island and wonders at the cars and clothes along the beach, and says he is looking for deead bodies, but doesn't expect that any dead bodies would have survived this long without being eaten or lost. So he's not surprised that he doesn't find any bodies, he says. But he does find bodies. He reports seeing dead deer, boar, snake, a turtle, a dolphin. There's no reason these bodies all survived but all the human bodies were eaten.
I grew up in Harrison County. There are more rumors and fantasies than you could shake a stick at. Until I see some evidence that there are 1172 still missing, or reports of numerous bodies in the surf, or the Coast Gaurd's admission they were told not to pull bodies out of the surf (that's a hard one to buy), I'm going to believe the coroner over Dr. Marble. Hats off to him for calling Cheney an asshole. Now, show me some evidence.
There weren't enough people in Harrison County for 1172 people to be missing and not have that be the biggest story around. There were only 192K people in Harrison County before the storm, and that includes a lot of people inland.