Bunkai meaning 2 person, kata meaning 1 person. Both = a whole. As this was pointed out earlier on in this post.I'm not putting in a plug for Shotokan. What I am pointing out is the fact that these guys are saying that the SD part of the system is in the bunkai, not in the sport side.
Most styles are valid for SD. Everyone will defend their given art which is ok, it's all good for discussion. I feel the OP is valid and gives food for thought to create a well rounded sharing time.