The key component (or at least one of the key components) of the proclamation of the gospel is not simply the presentation of the truths about the Saviour, although that is essential to the proclamation of the gospel.
What really makes it deserve to be called good news is not simply that this perfect man, the Son of God in our nature, exists, but that he is available to us, an accessible Saviour. Unto us a child is born, unto us a Son is given. Unto you is the word of this salvation sent.
He is not someone to be admired from a distance (although he should be admired by one and all) – he is there to be taken hold of, appropriated, received and rested on for salvation, by us. He who knew no sin was made to be sin for us, so that we (who knew no righteousness) would be made the righteousness of God in him. It’s not a complete gospel if you only talk about who Christ is, abstractly considered – what makes it a gospel for us, for us humans and sinners, is that we can have him for our own.