I think there is only two group buys which have over 300 pieces ordered, this and the German one. First batch is going to be 10,000 pieces. I see no reason to rush it especially when in a post made 4th May Friedcat said there is going to be a lead time of 15-20 days, so anythink isn't going to get shipped out before 19th May.
You're assuming there aren't non-group purchases being made? Group buys are for individuals. Retailers and ebay marketers may have made other orders.