I just pitched the one vial, but only because I wanted to limit my brewery's exposure to brett. At 1.007 I think the available sugars are nothing one vial couldn't handle, that being said, most of what I read about brett suggests pitching rates closer to lager levels. It is possible that two vials or a starter would accelerate the maturation of the brett character but I sort of doubt it. I suspect mr. Fletcher carbs this beer with champagne yeast in addition to the brett, and I will ask him upon our next correspondence.