Skill gap within 1 Division

How is it possible that there is such a big difference in skill between the players of 1 division? When I play a ranked I expect my teammates to play nearly as good as I do. Less worse or better. But it seems like thats not true. In my last 5 games I played Ornn toplane and won my lane in 3 of 5 games. In this 3 cases my adc and midlane fed their opponent so hard that i couldnt do anything. The other 2 games I lost my lane my mates lost their lanes too, but harder then me. It seems like my mates dont know at all how to play from behind or against someone who is stronger then you. How can they reach the same rank as I without playing at the same skilllevel as I do? I dont understand that.
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