Actually there alot of missing in arena becoz attacker always have opportunity to win with knowing ur hereos location. 5 hereos in 1 lane can win by full dpser team just run through it. Y dont we fix it with min 1 hereos perlane thats mean u can 1 1 3 the lane or 1 2 2 as u like. How about that?
you can always just change your defense often...takes awhile for arena chances to come back so use that time to mess them up by changing the setup. it would ruin arena if you had to have one in each lane.