And as for there being a Gangrel primogen, it's pretty much up to the Prince. Many do not allow Ganngrel primogen because the clans has officialy left the Camarilla and gone independant. If anyone particularly wants it, alright, but I think we are fine without. Or the Sheriff can take the role.

More with the background: I'd guess that quite a lot of Gangrel probably arrived in the city in the early years, but many would then have drifted off as it became apparent that the Gngrel in charge were very much Camarilla Elders at least as much as they were Gangrel.