if the current champ in each weight class retired TODAY.....

who would be in the title fight, and who would be the champion?

you can use grand prix style elimination if you feel more than 2 deserve this shot,...

Source: http://www.mmaforum.com/ufc/132609-if-current-champ-each-weight-class-retired-today.html

Gilbert Aldana  José Aldo  John Alessio  Houston Alexander Ricardo Almeida