As I discussed the other day, you need people in positions for which they have the right attributes and skills, but you also need to expect top performance.  Attributes and skills mean little if they’re not embodied in action.  Let your team members know that each of their assigned positions is not a given, not something they can expect no matter what; tell them the positions have to be earned and kept by top performance.  And see that you follow through on these expectations for yours.