What is The Precise Character of Kingship?

My professor, my advisor of my Th.M. and friend Dr. Jerry Bilkes has taught me that,

“What appears from a close examination from the texts that set forth Christ‟s kingship is that this is an economical kingship. It is true; he has an essential kingship in his unity with the Father, as Sovereign God. But, he was given the kingship economically or officially, so that now, on the basis of his accomplishments, he is now exalted. He reigns over both his church and the world in his office as king. He was endowed with this office, and assumed this office in the covenant of redemption. Therein he has an office which man was given in his creation, but which he basically lost because of his fall. He had been commissioned to subdue the earth and have dominion over it (Gen 1:28). “Thou madest him to have dominion over the works of thy hands; thou hast put all things under his feet” (Ps 8:6). Man, however, subjected himself willingly to the rule of the devil (Rom 6:16). God, however, declared war upon Satan and his hosts: “I will put enmity” (Gen 3:15). This Christ fulfilled: 1 John 3:8: “For this purpose the Son of God was manifested, that he might destroy the works of the devil” (1 John 3:8). He is given this dominion not simply as Divine Person, for nothing could be given to him that he did not already have. But as Mediator, he is given these things; he accomplishes these things, and applies them in his capacity as the Mediator till this very day.”