Why is ranked broken???

I have two example friends who play league, one who is in B5 and the other was in S3. the problem is, the b5 is SO MUCH BETTER THAN THE S3!!! the b5 has 5 lvl 7 and 277 masteries atm, where as the other has one lvl 6 and 63 masteries in total atm. the S3 is not good at all and still gets a higher ranks than any other friends. Pls rito fix this...
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