THE ESSENCE: Fallon Worldwide followed a tough 2004 with a worse 2005. It split, for a variety of reasons, with clients including BMW of North America, Dyson and Lee Jeans. Sony Electronics was in and out in five months. The loss of showcase clients amounted to more than $100 million in billings. It also lost a string of top creatives, including Bruce Bildsten. And while closing the New York office made financial sense, it cost Fallon a creative hotspot. On the plus side, creative leader Paul Silburn lured some top talent, and the agency picked up NBC Universal media planning and KitchenAid. The agency believes it's well-positioned for 2006. It better be.