alright you clowns have convinced me that offering a full pardon for the winner of the Gorilla fight is not great.
So, we shall abandon the plan to use death row inmates.
Instead, we can use homeless people. If they win, they get millions. If they lose, they go out in the legendary gorilla vs 100 men fight.
Society and governments have abandoned these people to their fates. So give them a chance. I'm sure Mr beast would totally be up to doing this.