A plant doesn't make any sense. only luck found the bills. believing they pushed pieces down 3 feet is not logical..sure they might of contaminated the scene to some extent, but not to that degree. it seems everyone tries there hardest, like promoting a suspect to build the plant theory up. Cooper could of picked much easier ways to throw them off.
Putting the Ingram's into the theory would mean they know who Cooper is, or was. Tom Colbert is trying that angle. it doesn't fit either.
when did Cooper bury the money, soon after, or years later. if it was years later what is he really throwing off? they still don't have a clue, so why would he plant the money years later? if it was soon after, he would have to have dug pretty deep. the erosion would expose the money. I believe that is possible, but not with a plant. lots of confliction's about the way the sand was spread, and the layers..I lean towards the dredge more than anything but can't prove it without seeing what a dredge would actually do to the money.
Farflung showed several articles about people missing. I'm sure all kinds of theory came of them. one was an older man who went missing for a month, only to be found 50 feet or so off a main road. his car was hidden by tree's. he had a heart attack, I believe. I'm sure everyone was way off base on what happened to him...