The pitcher will tell the 5man where to play as based on where he is trying to pitch to a batter. But yes a very open ended question none the less. The 5 man should play in closer to the bag so we can make all the plays at 2nd which allows the SS and 2b to play deeper in the holes. And the pitcher will fill which ever side the 5man is not on to take away that gap.
I have never lost to a 5-man IF. Because they all suck