And finding her remains took away that bargaining chip from the defendants. They won't be able to try for plea bargain by stating that they will lead LE to her remains. Her remains being found in this manner is actually a good thing (well, as good as it can be, under the circumstances) because now the DA can seek out the death penalty and the defendants have nothing to offer to try to avoid it being an option. The defense cannot try to say that there is no evidence of a murder and that Holly probably just ran off somewhere.
God bless those ginseng hunters!