Answering a Question

WCF 7.5 speaks of the Covenant of Grace being differently administered in the time of the law, namely through prophecies, sacrifices, circumcision, the paschal lamb, and other types and ordinances all foresignifying Christ to come.

My question is, could not David and Solomon be considered administers of the Covenant of Grace in their function of ruling and defending God's people and restraining and conquering all their and God's enemies?

The reading of the WCF is such that the statement "This covenant was differently administered" refers to God's administration of the covenant, not to the various administrators who would have been part of the covenant of grace. David and Solomon thus fit under the category of "other types." That is, in their role as kings, they typified the work of Christ as king. Likewise, the Aaronic priesthood typified Christ's priestly work, and Isaiah and the other prophets were types of the prophetic work of Christ.

It is true that David, Solomon, Aaron, Zadok and other were administrators of the covenant of grace, as elders are in the New Testament context, but that is not what the WCF has reference to in this paragraph.