Question: Which director was held more positions, Brian G. Hutton or Holger-Madsen? 
Sentence (from "S/2004 S 17"): Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on May 4, 2005 from observations taken between December 13, 2004 and March 5, 2005.
Relevant evidence: No