So I’ve had this theory for a while on why there are six main characters is Six Of Crows. So there’s this rhyme about crows that goes
”One for sorrow,
Two for joy,
Three for a girl,
Four for a boy,
Five for silver,
Six for gold,
Seven for a secret never to be told.
They’re crows. Six crows. And why are they pulling of the heist? Money. Money and gold are normally hand in hand. Coincidence?