Sanders makes a great point in his lecture: God is at the center of salvation. It is essential to understand the size, shape, and access of salvation from a theological holistic whole. Knowing the doctrine of salvation is vast. Thus, Sanders rightly teaches a proper understanding of the vast doctrine of salvation must be seen through the Son and Spirit in a theological catalog of categories. Understanding the doctrine of salvation in a theological catalog of categories helps formulate a concise and comprehensive knowledge of what salvation means and how it is applied (e.g. the Ordo Solutis).
Sanders has a great sense of humor, so enjoy!