Shigemori's passing hits Kiyomori hard. However, with Shigemori gone, no one is left to stand up to Kiyomori, leaving his whims and ambitions unchecked.
I'd say "infantile" rather than "young."
‫بالأحرى "أحدث" وليس "أصغر".
Er ist doch noch viel zu klein.
Yo no diría "joven", sino "infantil".
Il est trop jeune pour régner.
Diria "infantil" em vez de "jovem".