Nick Nanton is an award winning director, agent, and author. He is a 5 time Emmy Award winner for directing and producing the short films Jacob's Turn, Esperanza, Mi Casa Hogar, and Visioneer. Nanton is a 13 time Telly Award winner and has co-authored several best-selling books. He is the founder and CEO of The Dicks and Nanton Celebrity Branding Agency. Using only the above description and what you know about the world, "Nanton has won 18 awards but has never been the sole author of a book." is definitely correct, incorrect, or inconclusive? 