I honestly do not mind seeing the rematch. Everyone else is tied up and Bigfoot is the best option if Cain wants to stay busy.
JDS - Just got dominated by Cain
Barnett -Hasn't fought in the UFC yet.
Nelson - an okay option if you want to see the UFC's first death.
Werdum - fighting Big Nog
DC - Fighting Mir
All the other guys who could have an argument for the title shot just aren't in the picture at the moment. The only other option out there other than Bigfoot is the Struve v. Hunt winner. And right now Bigfoot is a Top 5 HW and Struve and Hunt aren't even Top 10. Bigfoot is really the only option.
Greatest of All Time