He's just so far from deserving it in comparison to so many others. I don't think a single person could argue that the victorious and championship skins were undeserved last year. Sivir and kalista dominated both pro play and solo queue. Maokai's just kind of there. He was a god in season 4 and 5 but he was hardly as relevant as gangplank, ekko, jhin, graves, viktor, etc.