Have said this before and am sticking with it. Alex was called "the host" and not "the star", because the real stars of Jeopardy are the players and the question material. Alex was the navigator who kept everything on track, and did it with charm and warmth. As long as whoever comes along does not put themselves in the mindset of being "the star" and making the show all about themselves, that's 50% of the battle right there. Respect the format.