So lately I have been reading about the power struggle at the Pride Lands between king Scar to the supposed-to-be-dead King Simba, and got into realization: The only time I know about that scar admitted killing Mufasa, was when he was under a threat from Simba. It could be that Simba actually used this position to frame scar, and justify his dethroning. This alone may lead us to the fact that SIMBA killed mofasa, we know about some edvinces that's in his younger days, "he couldn't have waited to be king". But for that I need to know, is there any other evidence that Scar was the murder of mufasa, and not Simba?
Can we stop with the circumstantial evidence, please? Hakuna Matata, my friend. Do you know what that means? No worries for the rest of your days. Because if you worry, you may no like the results.
All evidence pointing to Simba was provided by our trustworthy friends, the hyenas. You said it yourself, Simba just wanted to be king so much that he committed patricide. Someday vengeance will be taken upon our king.
The thing is that Simba was very young at the time. I find it very unlikely that a cub of his age would have the patience and intelligence to kill off his own father and the complete lack of empathy.