Thank you for the clarification.It seems my use of the word creative was an error. I assumed everyone understood the word kata equally. This is not the case. Over time we deepen our knowledge and uncover further details and subtleties in the techniques. Not once have I claimed we can interpret techniques in any way we choose. The use of the word creativity was in how we learn, use and combine the applications. Each kata contains a series of moves and techniques which can be used in a multitude of ways. A beginner doesn't see the same amount of applications as one who is more experienced. The more experienced we become, the more our creativity comes into play. You could think of Muhammed Ali and his creative use of basic techniques and footwork as one example.
The practicality of bunkai probably exist on a normal (gaussian) distribution curve. Turning ones head in a kata to foveate ones imaginary enemy is at the peak of the curve, the same turn being a glancing deflection of an incoming spear thrust with ones forehead is probably on the more distal, lower areas of the curve.