Adopting a child is not an uncommon occurrence in this world.
However, if Adam were to adopt a child, the implications would be significantly different given his stature.
Firstly, he is not married and does not have a child of his own to inherit his legacy.
In the absence of a child or any other heir, as per the world's customs, all that he has built is likely to be reclaimed by the king.
Still, the power Adam holds is immense.
If he were to depart, his territories would likely not be reclaimed by the royal family.
Indeed, if the power under his rule were to erupt, even the royal family would face the risk of being overthrown. They would not dare take other actions.
If not reclaimed by the royal family, these territories would then likely be divided amongst his men.
Subsequently, these men may trigger wars, leading to a new round of annexation and consolidation.
However, this would inevitably lead to chaos.