Jesus is the BODY that held the Express image, (spirit son} IN him.
Jesus' Spirit is the Spirit of God the Father. Jesus is called a Son because He came from God the Father and that is how humans understand it when one comes from another.
You cannot separate Jesus from the Christ.
Jesus is the Christ.
Jesus was in heaven and was the first born over all creation---God made Himself a body and then made everything through that body.
Jesus gave up that body and came to earth in a flesh body in the womb of Mary.
When Jesus died, rose, and ascended to heaven, he received the body he had before he came to earth.
When Jesus raises us up at the resurrection, we will be given a body like his, a spiritual body that does not die.