I will give it a try......
So I would like to point out on this subject that the standard does say the Sumatra needs to have a full throat. In order to have a round head that matches the description, the throat must extend some giving it a full appearance. Try drawing a circle for the head (excluding the beak and it will give you a better picture). If you do this to the blue hen you will see she is a better specimen than the splash. There isn't a round appearance on the head of the splash. Take into consideration the ABA standard does state that the Sumatra needs to have a well developed dewlap. Each judge will determine the merit of the specimen based off what he or she feels fits the description. So it could be a little different from show to show. In addition, if breeding to the standard of perfection, you must take in to account the whole subject, and see how each section of the body defines the breed. If the Sumatra in question does not have a full throat, the head will appear to be long, which then can make the beak appear even longer. If the bird in question, like the splash has the extreme end of the full throat, then it gives the appearance of lacking arch to the neck, and the beak appear significantly tiny.
Hope that brings up more discussion.