A further purpose of annexation is honoring or elevating someone. An entity may gain reflected standing from a relationship to a person of recognized status.
عَبْدُ الْخَلِيفَةِ رَكِبَ
The caliph's servant mounted or rode.
Here «عبد» is identified through «الخليفة». Where the caliph's rank is salient, the servant's association can become a mark of distinction. The rhetorical task is to determine which participant is being elevated by association and why; not every genitive relation automatically implies honor.