by Squeely » August 6th, 2016, 8:20 am
Voted no.
SP works well because of Kiara. With another male cub, SP could easily become overcrowded, with the odds a bit too in favor of the Pridelanders. The final showdown is so intense because the Pridelanders and Outsiders are roughly evenly-matched. Kiara strikes a very unique balance of being Simba's opposite in some ways, while also being like him in other ways, which keeps SP from feeling like too much of a retread of TLK. Kopa would probably throw that interesting dynamic off a bit.
As far as TLG goes, Kiara is in line to become queen, and Kion is leader of the Guard. I don't really know what role another sibling could fill here.
I don't really dislike Kopa or anything, I just don't see what could be done with him that isn't done better by Kiara and/or Kion. Both of whom are far more canon, and quite frankly, better-developed characters than Kopa is.