Quote Originally Posted by February
- Why is Hidan Immortal? Kakuzu stole hearts to extend life, Orochimaru uses his advanced replacement techniques, Sasori was mostly a puppet, but there just seems to be no explanation for Hidan.
Who cares. Why not take him at face value? Maybe his evil god empowered him.

- Why did the 3rd seem so eager to stop Oro from summoning the 4th's coffin?
Because he would have gotten his ass kicked trying to fight the Fourth Hokage too.

- Why didn't Choji die after the sound five fight? (<-- not really unresolved plot point but angers me)
Conceit of serialized work where you never kill off a character because you can draw fanboys into a downtime chapter with cameos.

-How does killing your best friend physically allow you to have a better Sharingan?
Sasuke developed the Sharingan when trying to protect someone important to him, so its next evolution is killing someone important to him.