You start wondering if the PF has flown seaplanes in his career as well...
He obviously put the "butt" of the 'plane in the water while holding the nose high for so long that one of the engines did not even come off, when they finally dug in.
Yes, but isn't that what you'd "naturally" do? You'd want as much aeordynamical braking as possible, regardless of any knowledge of seaplane technique.
Regarding the CRM-discussion here, "captain's cockpit" etc: This discussion is nonsensical, for all we know the ditching was the FO's suggestion. Yes, the captain has final say and responsibility, which is as it should -- but I certainly hope the FO had his say and that there was a discussion of possibilities and an agreement in the cockpit. According to one news article (don't recall where) the possiblity of landing at nearby airports was even discussed with ATC.