its good idea, but remove chop and custom maps out of the equation.
most people that play gow don't play chop and don't want to play chop.... or arena.
its a good idea because of playstyles. you're often good vs someone but not that good vs another,
like for
example: player A might defeat player B with ease, and player C might usually defeat A, but player C might have a a hard time defeating player B.
this happens quite often
so someone having a 2nd chance sounds just.
just stick to official maps, or have a custom map tourney by its own.
feels unjust to have your skills and your hard earned #1 measured by playing a nonofficial map