They're still playing to learn how to win, not so much to win. Habits and attitudes are still being formed, and something like this, if they start Andy and he wins, can eventually feed into a self-fulfilling prophecy of sorts.
I don't know if Andy gives us the best chance to win; he probably doesn't. But if they do win, great. I also think there's a message hear to Comrie that if he wants to be The Starter he has to earn it; it won't be handed to him.