A company seeking and acquiring the best man/woman for a position within their ranks is one thing, onboarding the only person who qualifies to perform all duties and tasks perfectly is another. If there is such a person in the business world, their value is unmatched and any request by that person becomes a command.

        "The Gospel of John was written by the apostle John, the son of Zebedee. He was a Palestinian Jew and a member of Jesus’ inner apostolic circle. John most likely wrote his account of Jesus between AD 70 (when Jerusalem was besieged by the Romans and the temple was destroyed) and AD 100 (the approximate end of John’s lifetime). Most likely he wrote his Gospel in Ephesus, one of the most important urban centers of the Roman empire. John’s Gospel was aimed at both Jews and Gentiles living throughout the Greco-Roman world. John frequently explains Jewish customs and Palestinian geography to non-Jewish readers. John also presents Jesus as the eternal Word that has now become flesh, utilizing the background of Greek thought familiar to his Gentile audience. Yet John clearly also has a Jewish audience in mind: he reveals Jesus to be the Jewish Messiah, the fulfillment of many Old Testament themes, and the eternal Son of God sent by God the Father to mediate a new relationship between God and man." 

        However, John also used the theme of Only One quite a bit concerning Yahweh and His Son, Yesuha The Messiah - Jesus The Christ. Observing the fact John's audience was both non-Jewish and Jewish, the proclamation of Only One in a poly or many-god believing society was a challenge indeed. But John had the very words of His Savior ingrained in his memory to lean upon as he quoted Jesus saying, "I am the way, and the truth and the life. No one comes to the Father except through me." (John 14:6)

        The emphasis of singularity or oneness is displayed in several verses of John.

"How can you believe since you accept glory from one another but do not seek the glory that comes from the only God?" -John 5:44

"The Word became flesh and made his dwelling among us. We have seen his glory, the glory of the one and only Son, who came from the Father, full of grace and truth." - John 1:14

"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life." - John 3:16

"Whoever believes in him is not condemned, but whoever does not believe stands condemned already because they have not believed in the name of God’s one and only Son." - John 3:18

"Now this is eternal life: that they know you, the only true God, and Jesus Christ, whom you have sent." - John 17:3

        There is no ambiguity here, there is no unclearness about whom to believe - God and His Only Son, Jesus. There is no uncertainty of what to believe - that God so loved the world, that God gave Christ, and the request by God of belief in Christ's sacrifice and resurrection. The result is everlasting life instead of everlasting damnation.

        In all that has been created by God, seen and unseen, there is only one person that could ever fulfill the plan of salvation - Christ Jesus, The Lord. There was no creature, human or spiritual being that could fill the role and perfectly perform the duties of Savior besides The Word of God in flesh - Jesus Christ. Not only was Jesus the Best man for the job, He was The Only Person For The Job.