This is a long-winded expose of northern Virginia. I only made it about half-way through, there were some subsidies promised apparently.
In any case, I never considered locations other than Northern VA as viable for the HQ2 business, it was 90% going there from the start IMO due to 1) Existing Amazon Offices 2) Existing Amazon Datacenters and major internet exchanges 3) Proximity to DC.
So, to present this as to 'How Virginia Won' is a little wishful IMO. Virginia did nothing other than happen to be the place where other companies are doing business.