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I think for the weekly contest players should be playing against players that are around the same levels. If a player are in the 7000 levels they should play against others in 7000. When someone in 7000 is playing against someone in 4000 their levels are easier than the 7000 levels. It's not an equal opportunity.
Regardless of the level the players are at the Weekly Contest can never be 'fair' as some people buy gold and boosters for their game and some players have advert features that provide free boosters.
Interestingly we have been told many times by one of the level designers that the hardest levels in the game are those between 4000-6000