If you can not attack and nobody can attack you , what's the point to entering a fighting contest? If you can not fight or be attacked then imo, this is not the contest for you (a dead player).
To be honest because of this, I feel dead players shouldn't be able to participate in a fighting contest, as even two dead players still can not attack one another.
I vote to ban dead players from fighting contests like this one due to these reasons below
1. They can not fight
2. They can not be fought/attacked
3. They can not recruit creatures
4. They are constantly recalled to the graveyard so this means they can not sit in a place long enough for players to attack them.
5. All reasons said above create a 100% unfair advantage for both the dead , and alive players, and waste alive players time in a contest of this sort