I ended up voting no, but because it's too damned obvious that Kovu is their son also. Disney just didn't want to have the whole "incest" thing wrapped into the plot because then there'd be stupid Christian groups bitching and moaning about it. So they say "Hey, let's have Nuka be their only son and have Kovu be adopted despite the fact that he has the same similar fur color, body style, etc. of Scar." Besides, there are families out there that have at least one stupid kid in the mix. I should know, I'm one of them. XD
kovu dun have scar's body type. if anything he has simba's body type. which is funny because zira has scar's body type. nuka could loo like hes scars. but i just disagree on the side of itt no mixing well. he is too doofy to be scar's son. scar an zira have almost the same nose. nukas is more rounded and bulbus.
The thing I don't understand is that living where they did, they had so little nourishment that I can't see Kovu turning out so full figured and rounded like he did... unless of course Zira was saving most of the choice kills (when they were available) for him to build him up. Which might explain how Nuka turned out the way he did. As far as him being a doofus, I guess I can't explain it. It might be something in the water, I don't know but just because he's an idiot does not mean that he couldn't be related to Scar. That's just how genes work.