... What if Sarabi was the one originally born royal in the pride rock, but as soon Mufasa became one with her, he and his family became royal as well?
That Muffy and Scar were originally strays, but were accepted into the pride rock due to the lack of males. Scar felt jelous that Sarabi chose Muffy instead of him, thus making him a king.
Muffy and scar were both tudored by their father in another pride far away. Yes they were born royal. But after a too young age, their pride was annihilated, and only those two survived. During the annihilation, scar was hurt in his back, and badly wounded in his eye- thus his scar. They were told of another pride in the far east, and began to walk. Scar was originally the one to become king of those two back in their pride, because his father chose him right before his death.
When they arrived they were greeted by the lionesses at the pride rock. That is when they met Sarabi, the first born princess.
When the time came, Sarabi had to chose one of them to become the the king, so that she could step up as the rightful queen. She obviously then chose Muffy as the king and her mate. However Scar who was prepared and looking forward to be king instead of mufasa, became jealous, and soon obsessed. aaand if you've seen the movie, you know the rest of this story!
Does this seem legit?
My other theory(from a previous journal) :