Can someone explain why I have silvers with less than 15 games played in mid gold game?

No my MMR isn't low. I'm in promos to gold 3 and I get a multiple silvers on my team? One guy is silver 2. I look both of them up and they both have about a 40% win rate with about 15 games played. Is this a joke? So in my gold 3 promos I have to win with silver 2 people with 40% win rates. Meanwhile the entire enemy team is either gold 3 or gold 2. Great game. Amazing matchmaking.
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