No matter whether the Empire will replace the commander after Aida Kang's death, or if the Empire has already replaced the commander, killing Aida Kang would still hold immense significance.
For in the knowledge and intelligence people possess, only the Martial Emperor III and Aida Kang of the Empire can stand against Ji Xinghe. The possibility of Martial Emperor III joining the battle is quite low, so if Aida Kang were to return to the Transition Base and block Ji Xinghe, how could Ji Xinghe now enter the Transition Base unfettered and precisely scout its entrance coordinates?
Yet Ji Xinghe chose not to kill Aida Kang, even when he already knew that Ji Rongxinyue was pursuing Aida Kang.
Could it be...
"Report, General Ji's blood loss has already exceeded 3,000 ml!"