You know... just because its so much smaller. I'm going to say the teams league can only challenge the person directly above them. I don't see it getting too much bigger, so unless the people above you can't get together within like a week, lets keep it to single jumps.
My Creations in Modnation Racers! Check zhem!
http://community.modnation.com/en-us/players/IvoYaridovich/creations