Ranked Elo is independant from Normal Elo. You'd be surprised; there a lot of Gold and silver players that are deserving of Diamond and Plat but they just don't play ranked at all, some of my friends are a good example. A friend of mine is Diamond and the other is Silver but I can safely say that my Silver friend is better than my Diamond friend. It just shows that rank in league isn't an accurate portrayal of how good you are; it just shows how much you play the game (ranked). Master and Challenger however, are a different story but even then, the people who rise to the top of the ladders are those who just play the most.