Every Kage had several people they favored during their tenure. These were usually individuals with absolute loyalty to the village, along with exceptional strength and intellect.
These people were generally called the Kage's successors. The reason for saying "people" was that there was more than one such candidate. Back then, the Second Hokage had many candidates under him, including Hiruzen Sarutobi.
He only chose Hiruzen Sarutobi as his Hokage successor at the very last moment.
What Moriyue had not expected was that the Raikage would also list him as a candidate for the position.
In truth, the Raikage had already decided whom he truly intended to groom. Although Killer B was his younger brother, that guy's personality was unsuitable for becoming Raikage. He was not accustomed to living such a constrained life either. He had the strength, but being Raikage could not be about strength alone.
Therefore, the person he truly intended to nurture was Darui. Though that guy usually looked like he dreaded trouble, he always completed every task A gave him brilliantly. He might have seemed somewhat reluctant during the process, but at least he had the ability to solve problems.
Darui's strength was beyond question as well. He had mastered Storm Release, a Kekkei Genkai that was itself proof of his strength. Thus, the Raikage was fairly confident in him.
As for why he had added Moriyue to the list of Raikage candidates, A himself did not know whether his choice was right. He simply felt that Moriyue had the aura of a leader, and his strength placed him among the very best of his generation.
Moreover, with Moriyue joining the competition, A hoped to give Darui a sense of urgency. Spending every day so sluggishly was no way to behave. Only competition could bring vitality.
Led