I carry you early, you carry me late game.

If you gonna ADC, that's your job. If you lose a 30 min game when playing an ADC, 80% of the time it's your fault, if you didnt farm right, if you didnt build right, if your positioning it's bad, then that's why you lost that game. Top/Mid/Jungle will only get you so far. Even the best engage will be meaningless if you are not there and deal dmg. Even the best peeler wont keep you alive if you are in the front line.