Changes to getting S's?

So ever since the new runes came in this patch,runes can now determine how your game goes,for instance a lux taking electrocute vs a lux taking meteor(dont rlly know whats it called) then most likely the one with meteor would have a better game since electrocute doesnt proc easily on lux anymore which sucks btw but a question noone has been asking is do rune builds now determine if a person will get a grade of s or a+ each game?since the old system i knew factors in the champion you play with the role and build your doing(ie.Mid AS teemo,mid ad olaf,ad darius,ap mf) so if by chance a nasus with electrocute managed to actually do good in a game and lets say that there were some trolls that did the same thing but did bad in that game.Would that nasus get an s?