Curious, which are your game level and what server are you..? Cause I'm from S11 -with level 79- and I've kicked a team in level 110 (3 members only), and other team up level 80, with orange power. Depending on how power up your own team (skills level, enchantments and runes) you can defeat them.
Remember, unlike Crypt, in Expo you can retry with the same team, only make sure that any member falls down, and the enemy will fights against you, with the members and HP remaining. Keep this in mind.