Yeah, but in the wild, Scar is probably the only male lion. Plus, he has a whole pride of lionesses around him. So, he probably used a lot of them as mates to produce heirs. However, I bet some of his heirs were either to sickly, died in infancy along with some of the lionesses or just ran off. Those that remained probably sought to seek to overthrow Scar and probably were taught to do so, but their moms.
How come in the movie we don't see the lionesses as scrawny like Scar is? They look actually the same if not fatter. Maybe Scar gave them better treatment seeing as they produced his heirs. But, still why would they be complaining if they got plenty to eat and they were favored over the hyenas?
In the wild most prides got two dominate lions. So in reality Mufasa and Scar could rule together but they didnt. Its pointless to compeer lion king with real lions. Your doomed on that argument befoe you even start.