I think a higher ranked should be able to challenge down if they are idle for 4-5 days. That would make the bottom squads more active because they wouldn't want to be idle incase a higher squad challenged them. It would make a much more active ladder, and the top 2 squads (DFL & EX) could play somebody besides themselves. I like the DFL guys alot but I see them more than some of my less active players.