If 100% of your target area is reached (unless your target area is VERY small):They can't all go to your small group. They can't all go to your church. They can't all go to your Sunday School. They can't all go to your Vacation Bible School. They can't all go to your retreat. What happens when someone is in a Bible Study led by one of your church members - but don't come to Sunday morning service? What happens when someone goes to a DIFFERENT place? How do you enable them to be part of an ekklesia - any ekklesia? - even if it's not yours? Do you still care about them? How do you express that?