Why does the last verse of a surah sometimes not fit the pattern of the previous ones?

The answer lies in the verse itself. When it speaks of the end of all things, when only God remains and He alone rules, the old order comes to an end and a new one begins. The break in the pattern matches this break in the content.

In some chapters of the Holy Qur’an the verses follow an even pattern, and then the last verse departs from it. At first this looks like a break. But the reason is found in the content of that verse. One only has to read it carefully.

The closing verse speaks of the moment when everything has come to an end. The story of this world is over. Only God remains, alone in His glory. Then He is Ruler and Owner in the fullest sense. No one has any rights or possessions of his own any more, except what God distributes anew. People no longer have any choice.

With that day a new order begins. It is entirely different from the old one. Some who had everything in this life will find themselves without the sources of their happiness. Others, who by worldly standards lived an empty life, will be enriched in a way no human being can imagine.

That is why the text ends exactly here and in this way. What held before no longer holds. When the last verse steps out of the usual pattern, this fits its message. The old order is over, and only God remains. The verses above express the same thought in different ways.