7-3 placements in a fresh account

Hi I've been playing duo from my smurf account (s1) with a friend (fresh account). We won 7 out of 10 of his placement games and he got placed in s4 which is low in my opinion . I know 7 - 3 isn't perfect by I think he should be placed around s1 - s2 . Is this normal? Cause I've seen accounts that have won 4 games and are laced in s4 . Anyway here is a link of both our op.gh so you know I'm not lying : http://eune.op.gg/summoner/userName=Luckhack (my friend) http://eune.op.gg/summoner/userName=Xxmitsosxx (my smurf) (P.S im not like diamond on my main I'm just p5)
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