Of course, team composition is the best advantage you can have, levels mostly give you an edge only (unless some cards become absurdly better when leveled up xD)
Just one thing, since this is the battle from #18, you should submit this fight on the next post. I will try to remember it, but the safest thing is just to comment this on the next post when it finally gets published. For some reason, the tournament didn't resolve yet so I don't have all the results and all I can do is wait now :(