Here's a WaPo article from 2016 about obsession with hand size:
Disproving Jackson would be Minnesota Vikings quarterback Teddy Bridgewater, who had the smallest hands of all the quarterback prospects in the 2014 draftAnd from 2014:
As one would expect of someone who drafted the small-handed Bridgewater, Vikings General Manager Rick Spielman doesn’t think hand size matters all that much.
“A guy could have tiny Burger King hands, and — we’ll track him
This year’s small-hands winner/loser seems to be Arkansas quarterback Brandon Allen, whose hands were measured at 8 1/2 inches last month at the Senior Bowl. Feldman adds that Allen has been working twice a week with a masseuse to get his hands up to NFL par.
From 1st Overall to Free-Falling: What Happened to Teddy Bridgewater?
Bridgewater blamed the poor showing on his decision not to wear gloves