Your post and the info from your father kind of puzzles me. When he says he doesn't know where the "big money is in regards to each construction" I assume he means that there are some constructions more important than others, but he is not sure which are more important. And I understand it may be more of a legal than a technical matter. But it would seem to me that your father could at least comment on whether "losing" this construction would give the defendants a good argument for saying their products don't infringe.