In other cases...
In other cases, this council is given the responsibility of ruling the nation at the time of the king’s death in the interim, until the prince child reaches the age of maturity and is able to rule over the kingdom by himself. In conclusion, the logic behind the presence of Awsiyaa is clear, necessary, and expected to happen due to the importance and graveness of the newborn child, which is the divine religion that is conveyed by Allah (SWT).
The Divine Messages and Revelations provide the method and system for the way of life, behavior, and upbringing of a person. It transfers the person from one state into another psychologically, socially, politically, economically, and spiritually. These types of life-related, intellectual, behavioral, and educational programs are rich with many aspirations, ambitions, hopes, and guidelines that have a wide scope and range.
So, in order for it to grow, stand on its feet, accomplish its goals, and produce the desired effect, it requires a significant amount of time. Rather, it is certain that it will need a much greater time than the typical life span of a human being who will deliver the message from Allah (SWT). Such a prolific and great divine message would most likely need at least one to two hundred years for it to grow, establish itself, achieve its goals, and reform the generations.
This also depends on the nature of the society that the message is delivered to, and the means of communication that is available, as well as the extent of its acceptance and scope of its cultural and intellectual development. Due to all these factors, it may even take more time than these years.
Keeping in mind that the average lifespan of a human being on earth used to be between fifty and hundred years, then the supposed age of a prophet or messenger would in most cases be much less than the anticipated time needed for the delivery of the message, its growth, strength, and influence. Therefore, we can logically deduce that there must exist other individuals who would cover the remaining time left in the life of the Message after the departure of a messenger.
These individuals will oversee the propagation of the religion, its growth and protection until it accomplishes all its goals in the best way possible. So the presence of these Awsiyaa after the prophets is completely logical and we can expect that to happen, even if it still did not take place. And if it did already happen, then there is no surprise, wonder, or denial at all.