The Temple in the Gospel of John

The temple is a huge theme in the gospelo and not only that, jesus as the temple. It places the episode of jesus going into the temple and cleansing the temple at the very beginning of the gospel,. The synoptics put it at the end of the gospel. How does that serve john's purpose? At the very least, we can say without any kind of stretch, that the temple is ahuge topic in the gospel.