And that's it.
Narrative is used only when absolutely necessary.
This is an important observation and one which is interesting in relation to the Q Hypothesis. And after they went away, he began to speak to the crowds about John . . . These events are difficult to arrange into a different order, e.g. it makes no sense to have John introduced after he has baptized Jesus, or to have Jesus tempted about sonship before the baptism, or to have his baptism after his preaching, or to have John in prison before he has preached etc. Perhaps the most striking feature here is, though, the fact that the order involved is familiar to us from elsewhere. It is familiar to us from Matthew.