So i know its flex and all but why does it not take solo queue rank in consideration?

Just had a game where my jungler was silver last season, now unranked vs a diamond 1 volibear. top lane was silver 4 vs plat 4. adc gold 1 negative winrate vs plat 2 support match up was ok and then me mid diamond 4 vs gold 1 negative winrate.

ill let you guess which lanes got stomped. ye top,jungle,adc got stomped to the point where i swear if faker started at level 18 vs all enemies level 1 he would have still lost. I was set up by riot to lose this but why is my question...