I think you would get the same effect. It's not because of direct interference: I've seen it happen even when the extra "cooks" do everything they can to encourage innovation. It's because there's a natural tendency to self-censor your more "out there" ideas when you know there are people watching. In order to let them bloom, you usually need a safe, private environment where you can try out lots of things that don't work before you condense on one that does.