Joker Arroyo, Ralph Recto, Pangilinan, and Villar are winnable candidates. They are savy politicians but are not willing to join the administration ticket as they believe that their chances of success will diminish. The opposition side is getting too crowded with kamaganaks, thus the rumor of a third force.
From there, one can make several differing assumptions though it is too soon to tell. If the opposition is to win, they have to make some sacrifices.