You list ten possibilities, and you didn't even consider the possibility that one, two, or all three Js settled? And you jump from an "impasse" mediation result to going to trial - without considering the possibility that one or more litigants may file a motion for summary judgment at any time?
IMHO, you need to add to your list!
And I KNOW nuttin' (about how mediation may have worked out, or what the next move, and by whom, will be)!
SGE