Final answer:
The wisdom behind Al Aziz adopting Yusuf lies in historical practices where rulers would utilize enslaved or formerly enslaved well-trained and educated individuals for key positions, due to their loyalty and the rulers' ability to choose capable individuals over potentially incompetent biological heirs.
Step-by-step explanation:
The wisdom behind Al Aziz adopting Yusuf can be understood in the context of the historical practices of the time, particularly within dynasties such as the Ayyubids and later the Ottomans, who depended on enslaved or formerly enslaved people, like mamluks and Janissaries, to staff their armies and run their administrations. The practice of adoption or utilization of such individuals for important governmental or military positions, in contrast to relying solely on biological heirs, had various advantages. These included the likelihood of greater loyalty from those who were entirely dependent on the ruler for their position and the opportunity to select individuals based on their abilities and training rather than birthright.
Given these historical parallels, it is possible to deduce that Al Aziz saw similar advantages in adopting Yusuf. Since the mamluks and Janissaries were highly trained, well-educated, and showed loyal dedication to their benefactors, it made practical sense for rulers to adopt or elevate such figures to positions of authority. This practice circumvented issues of incompetence among biological heirs and reinforced the relationship between the ruler and loyal servants who were disconnected from their original lineage.