Johnny Unitaspic.twitter.com/E55mJ2Nz9W
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For population bias to explain the effect (about 60% of NFL quarterbacks are blue eyed compared to about 40% of Englishman) you would need NFL quarterbacks to be something like half Finnish or Swedish which is obviously not the case
Right and Blue-eyed Italians are a result of Germanic invasions vs more Arabic origin of southern Italians. Btw quick review of wikis showed: Unitas - Lithuanian Brady - mom is German/Norwegian/polish/Swedish Marino - half-polish
60-65% of elite NFL quarterbacks are blue eyed. That's more than the average in the Netherlands or Denmark. It's not a population effect, the only way for there that to be possible is if a huge percentage of QBs had ancestry from north of the Baltic and they don't.
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