1. Neji didn't see his father die right in front of him, he saw the cursed seal used in front of him.

2. The reason he doesn't talk like that ot Gaara or Sasuke because their clans make them that powerful, i.e. birth strength.

3. He learned the Kaiten by himself(thought of it himself) and it just happened to be a move already that only the main family knew.

4. Him being stronger than the Hinata should contradict himself isn't true. If being stronger means you can defeat the person than Hinata wins because her father can/has taught her how to use the curse seal against Neji or any other Branch family member to kill them.

5. Damn, I love Naruto!