Answer
The language of vassal king as opposed to suzerain king speaks about delegated authority, and Jesus is great David's greatest Son, was of that line of kingship. And even as David had his authority as king delegated from the Father, so too, Jesus did as well; God being the one with all authority. In fact, he is the one of whom Jesus says, "All authority in heaven and earth has been given to me," and therefore, sends his disciples in the Father's name to make disciples of all nations.
Answer by Rev. Dr. Simon Vibert
Rev. Dr. Simon Vibert is Senior Pastor of Christ Church Virginia Water, England, and the former Vice Principal and Director of the School of Preaching at Wycliffe Hall, Oxford.