An iron player in silver games????

Around two days ago, I had an iron player in high silver games. They weren't duo with anyone (literally everyone started flaming the poor guy) and nor were they smurfing. The dude took comet on Cait, ffs, and basically played at mêlée range. Now, I get its silver so no one gives a shit, but I still think this is a bit odd. Do you guys think it's a matchmaker glitch or something?
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