For me I think...probably. I wouldn't mind seeing combatants returning as long as they appear two times. Two appearance of the character is enough by the way and I think less using returning combatants would be cool.
I highly suggest you do, since there are so many great ideas for a combatant, but do not do it the way CFC does it. They execute it so lazily to the point some episodes are basically unresearched, since two combatants have been studied before.