I think it would be a nice change if they make a 3rd Arena type for SH.
1. Pick your top 5 guys that you think will win.
2. The game will Randomly pick 3 person from each team to fight in the Arena. (3vs3)
3. The game play will not let you pick only 3 person in the team and leave the other slot empty. You must pick 5.
This way the Rank will always change constantly and even if you win that fight the next fight your heros will change lol