Bisping is a bigger name than Rockhold.
I'm not saying Bisping/Kennedy/Romero would beat Weidman. All I'm saying is, if Jacare were to get injured or Rockhold were to lose, the UFC would definitely set up a Weidman vs Bisping fight or a Weidman vs the winner Kennedy/Romero fight (this assuming there are no other contenders).
The problem with your scenario is that the UFC wants Jacare to fight again.
Who do you think Jacare should fight and when? I would not put him on that Dec card if theres two title matches already scheduled