The Story of the Japanese 00817 [Kenmu Period] Dissatisfaction of the Samurai

Why were the rewards decided by Emperor Go-Daigo so biased?
One can only speculate, but it seems Emperor Go-Daigo had a habit of favoring only those who served close to him. This may not be limited to Emperor Go-Daigo, as it is a common occurrence in modern organizations as well.
For Emperor Go-Daigo, the close associates who were near him during his exile to Oki were his concubine, Ano no Renshi, and the low-ranking noble, Chigusa Tadaaki. Furthermore, Nawa Nagatoshi, who hid him at Mt. Senjo after his escape from Oki, was likely with him for a long time. He must have also held deep memories of Kusunoki Masashige, who came to meet him when he was barricaded at Mt. Kasagi, and he likely had deep feelings for Monkan, who was with him from the time he first planned to overthrow the shogunate. All of them received sufficient rewards.
On the other hand, it is believed that Emperor Go-Daigo had never met Ashikaga Takauji, Nitta Yoshisada, or Akamatsu Enshin at the time the shogunate fell. While he did judge that rewards were necessary for Ashikaga and Nitta, who were the greatest contributors to the fall of Rokuhara and Kamakura and had the pedigree of the Minamoto clan, and gave them a certain amount, Akamatsu, who was merely an 'akuto' (rebel) from Harima Province, was likely seen as insignificant by the Emperor. The Emperor underestimated the achievements Akamatsu made in bringing about the fall of Rokuhara.
Akamatsu Enshin, who did not receive a reward, eventually left Kyoto and returned to his home in Sayo-no-sho. Later, when Takauji opposed Emperor Go-Daigo and raised an army, he sided with Takauji.
While the samurai who had not worked by Emperor Go-Daigo's side were all dissatisfied with their insufficient rewards, one of the few exceptions was Nitta Yoshisada, who was appointed as the Shoshi (Director) of the Mushadokoro.
The Mushadokoro was an organization that managed the samurai, meaning he was placed at the top of the samurai who protected the capital. It is unclear what kind of lobbying Nitta Yoshisada did to obtain this post, but Emperor Go-Daigo was likely wary of the Ashikaga family, the largest samurai power, and thought to balance things by making the Ashikaga and Nitta compete. For that reason, it seems he gave nothing to the largest power, the Ashikaga, and favored the second-ranked Nitta. It was worth it for Yoshisada to abandon Kamakura and go to the capital.
The Ashikaga family, upon hearing of Nitta Yoshisada's appointment, let their dissatisfaction smolder. The one who held particularly strong dissatisfaction was Takauji's younger brother, Ashikaga Tadayoshi. Unlike Takauji, Tadayoshi did not have respect or affection for Emperor Go-Daigo. Takauji was pulled along by his strong-willed brother Tadayoshi, and gradually deepened his opposition to the Go-Daigo administration.
Emperor Go-Daigo's new administration had immediately taken on a major source of conflict.