IF this GOFF's counter-testimony IS SO IMPORTANT to the case, doesn't that tell us that PROSECUTION knows that all the other evidence and testimony so far, ISN'T WORTH A HILL OF BEANS? They HAVE TO HAVE THIS TO WIN!
The other possibility is that they think DEFENSE proved the body couldn't have been dumped by DW, and that OVERRIDES all the shaky evidence and testimony. (kinda the same now matter how I try to look at it).
The prosecution may have believed they could overcome Falkner's testimony, but were totally unprepared for Haskell's corroboration. They are definitely scrambling now. I'm still at a loss as to why they (prosecution)thought that their other evidence was so powerful.