Found an article where Chef Ramsay mentions that the winner is not actually running the restaurant but a part of a team.

Article by posted by Raphael on July 7, 2008.

Link: http://www.seriouseats.com/required_eating/2008/07/prize-of-winning-hells-kitchen-executive-chef-title-only-petrozza-christina-gordon-ramsay-at-the-london-hollywood.html

Chef Ramsay comment:

"Do you honestly think, my sweet pea, that I'm going to be that stupid and that vulnerable? That I would stick my ass to the window and give one of them a chance to run that restaurant, which is a multi-million [dollar] investment? One of them will be part of an amazing team, put in the deep end. But they will definitely not be running the room." For the record, the winner will be called an executive chef, but in fact will be one of 65 chefs responsible for all hotel meals, including breakfast, lunch, high tea and dinner..."