Hmmm... Some things I have been thinking about, and I would like to hear opinions about.
1.- about directions:
- when you go forward in kata, your bunkai is offensive
- when you go backward in kata, your bunkai is defensive
- when you turn either left or right in kata, it means you flank your opponent (sabaki) and attack his side.
2.- Both offensive and defensive bunkai have the same goal: to end the fight as fast as possible.
3.- Bunkai is usually part of a sequence of techniques. A sequence of techniques is usually a group of techniques performed consecutively in the same direction. A group of sequences of techniques is a kata.
4.- A sequence of techniques teaches strategy. An isolated technique (or bunkai) teaches tactics. A group of strategies is a fighting style.