Most of the Bunaki that I have seen out there is a complete waste of time.
If you are learning Kata and then the Bunkai, you are learning it the wrong way round.
Learn the Bunkai FIRST.
Make the individual moves work for REAL…. and then learn the Kata if you want to.
Here is a video clip with much more information…
I ramble a bit, but it is well worth a watch.