Ashe build

So, i tried for a lot of games the build pro uses, starting with botrk and then runaan and IE, finishing games with usually 15k to 18k damage, that is very low, then i started try to start with essence, ie and then runaan, ended up i was doind double damage at the end of the game, buying botrk like for 4th item if they had a tank or not. So, why do challenger player start botrk no matter what if the complexive damage is far far away from the essence start?
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