I haven't been able to find anything official on that one Rob. It's a great question. The way I score fights, effective punching is always above the rest... but that's just me, an untrained, amateur couch judge. If you are able to find anything that explicitly states anything about one criteria being more important than the others, post it up brother. I will add it to the original post.
From everything that I can see, all 4 criteria are equal, because nowhere does it specifically list clean effective punching being the most important.