Least important roles in game?

I was thinking about which roles are least or not necessary at all for a game to be played and wanna ask what other players think about that.From my gaming experience i can tell at my opinion ADC is least important role for game to function normally and jungle at some degree.What i think about ADC is that they are most important in late game, and for tower pushing while in early-mid game they don't seem to have effect as much as assassin,mage,tank and bruiser who dominate early game.After all ADC are too much item dependant that they must focus on farming to farm more than other roles exept support in which case i like to play non-meta where i'll support an assassin or mage who can make day hell to enemy ADC.
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