by thanigraphics » March 8th, 2010, 5:05 pm
Yep, that makes sense, even though I don't think that was the plot Disney had in mind. It was asked to Disney by one of a TLK community members, and Disney answered that in the TLK movie universe, Simba never had a son, even though that's contradicting if you see the ending.
For myself, I believe the same thing as you describe: First Simba had a son, Kopa. He got killed by Zira, Zira got banished and Simba gets daughter Kiara. It also explains why Simba is so over-protective towards his second child: his firstborn has been killed.