
Seriously though.
If Mufasa was Nala's father, then why would he betroth Nala and Simba when Lions rarely interbreed? -Kinda unitelligent of Mufasa to do this if that is so.
If Nala's Father was Scar/Taka, then it would perhaps explain the reason why she was spared when Scar assended the throne, because as we know from nature; when a new lion takes over a pride he kills all the cubs and drives away the male and occasionally female adolescents..for his own genes to be spread. Yet, if this is so..it doesn't explain why Scar would want Nala as his Queen in TLKoB. Unless Scar had totally lost his senses and felt that to maintain his royal line he would have Nala as his mate (in a way like the Egyptians did...but that was the female line who held the royal blood..).
However, since it is Disney...who make mistakes..don't think further through from just the actual plot of the movie...then Nala's sire could be from another Pride. Perhaps Sarafina was from another Pride? It does happen in the wild that a lioness can be driven away from her Pride..becomes a rogue..and may join another Pride. Or we can bring back the old theory that Nala's father is a rogue male.