Proof that supports are useless without a good team.
Remember when I said I would never support a feeding team ever again? I lied and eventually took this role again just to prove how useless it was.
After losing to a smurf that mained Draven with a surprising 95% win rate(18 wins and one loss). He suggested we should duo. After the game started, we ran into 2 issues, our Gallo forgot smite while GamorrahReborn the diamond 2 smurf(He told me in the middle of the game) couldn't play Kalista well enough to carry 4 feeders(the enemy team had Draven banned).
Despite keeping him alive as long as I could, our team eventually lost. So in theory, even if I supported a diamond player to the best of my ability, you still can't carry most games playing support to get a well rounded win-rate.