[{quoted}](name=Party Thranduil,realm=NA,application-id=3ErqAdtq,discussion-id=1UAhXAyR,comment-id=0002,timestamp=2015-07-12T05:38:13.765+0000)
Nah. I play a lot of champions in ranked that I dont have much mastery on, simply because I played them in previous seasons and before the mastery came out.
Even with Ekko, I played him in ranked before getting a mastery on him, still having a 67% winrate with him.
If you really have a problem with someone on your team playing a champion, ban them.
You are pretty much missing the point entirely. There are a lot of champions you havent played yes however for example, i have never really played riven but if i ever wanted to there are several resources available to me to give me a healthy head start on her. First day release there was 1 Tahm Kench guide on mobafire and random videos that taught you nothing about him really. While you can say you had a 67% WR with ekko a champion who came out the gate broken can you say the same about 30% WR Tahm Kench or 30% WR Bard or even other ekko players when he was released. Average WR aren't determined by a single player FYI.
Another Issue with your "just ban him remark" You will actually have a higher chance of playing the new champ with my suggestion then now. New champs are almost perma banned in ranked wasting a ban slot regardless.