woulda been more epic to see zira be the murderess that she is. killin kopa and sarabi! (tis what i think anyway) then kiara havin issues that she needs to fill in her bros shoes. after all, you can't very well just have a queen. not in that world. other than Uru ofcourse. but kiara's a tard. woulda made her more likable to have to live through that loss anyways.
and explain simba's fattyness, due to stress eating.