Commanders get the praise because they choose the targets, they give the orders for the tank, the tank's manuveres, etc.... The crew just carry out his orders. HOWEVER, if a gunner became a tank commander, any of the kills he made were automatically given to his score, Kurt Knispel being a great example of this. Also, tank crews were normally awarded medals all round, so in Wittman's case, everyone had up to the Iron Cross 1st class, and he and his gunner held the Knights Cross.