[quote="DGFone"]One, is that Scar is the mastermind of the plan, and what masterminds tend to hate to do is the actual work. Sure, Scar dropped Mufasa off the cliff, but that was a bit of personal revenge. This is why Scar had the hyenas start the stampede even after a few previous failed attempts at removing Simba. But as has as Simba goes, Scar didn't kill him because he didn't feel like being the one to do so.[/quote]
I agree wholeheartedly with this. I actually wrote
a short story exploring this very idea, and it touched on many of these points (e.g., Scar only killed Mufasa because the hyenas failed to get the job done).
I've also noticed that he tends to prefer mental "attacks" over physical ones (look how many times he leads Simba along or breaks him down using nothing more than mere words). It seems like for Scar, psychologically manipulating an already anguished Simba into thinking that
Simba caused Mufasa's death and that his pride would see him as a murderer if he returned to them would be a far more satisfying experience than simply killing him right then and there.