Plans for the villainous ape Koba to return in War for the Planet of the Apes were scrapped, with this development detail being bad news for the return of one Kingdom of the Planet of the Apes character. The newest installment of the Planet of the Apes franchise introduced all kinds of new characters to the series, setting up an exciting cast that can be reused in future films in the all-new trilogy. While there are hopes for one Kingdom of the Planet of the Apes character to return, Koba’s franchise history makes this comeback seem incredibly unlikely.
https://screenrant.com/kingdom-planet-of-the-apes-proximus-alive-return-koba-scrapped/