THE ESSENCE: In late 2005 World-wide Creative Chief David Droga left to start up a Publicis Groupe-backed venture. Before leaving, he added creative talent and boosted the agency’s awards-show wins. He, however, didn’t help bring in any major new business outside of some Coca-Cola Co. roster strides. Publicis, which has the structure to produce good holistic ideas, will need to find a creative leader who can match the charismatic Aussie’s energy. Publicis USA CEO Susan Gianinno beefed up marketing services units.