1. Kakashi wasn't going to kill them he was going to drop them from the academy, Sasuke wasn't the only one to find out the value of teamwork it was all of them that found out that they need to work together.
2. We dont know when Danzo was going to strike Naruto it could have been when Naruto got KM and once Naruto got KM I believe he surpassed Danzo.
3. Itachi did 90% of the work he had to save Sasuke the whole time they were fighting infact if it wasn't for him Sasuke would have been captured as soon as Kabuto used White Rage.
4. We'll have to wait on this one.