When playing 1-2 champs often enough, it is possible for a player to do well even in matchups which they are supposed to lose (note that, of course, some champions also just don't have any real hard counters). As far as "filling roles" goes, I've been told people at higher levels of play generally rely less on picking order and try to make a team in which everyone is playing the role they want to play.
Thanks to jhoijhoi for the signature!
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