I have presumed that if these 20 glyphs do present a calendar for the week, then the order of the days must be the same as in the two earlier weekly calendars, i.e. we start with Sunday. And as Sun is the primary power it is quite in order that the person in this glyph has some sort of headgear indicating status. We can recognize it as the headgear of the King (though this time without 'feathers' on top). From his thumb there is dangling something that looks like a 'ruler', and I guess this could mean that the Sun is the ruler for the period of the week. The Sun is the 'ariki-mau and he should come before everybody else and also show himself in a way that everybody will recognize.

The thumb, I think, is a special kind of finger. In the Swedish language there is an expression 'hålla tummen i ögat på någon' ('keep your thumb in the eye of somebody') which means that you are able to control by applying force, something necessary for a ruler. However, I cannot in this glyph see any such meaning. Instead I get the impression that the thumb is the source (tumu?) of the thing dangling down.

And why is this dangling thing not hanging quite vertically? Because the force of gravity is not strong enough - i.e. it is not heavy. The thumb often seems to be the source (generator) of hua, e.g. in this type of glyph (where the fruit is not hanging vertically) :

Another explanation (not excluding the first one of course) is that there seems to have been a custom of holding rongorongo staffs not quite vertically, at least the Santiago Staff shows evidence of this.

We should also remember Hb9-19, the central glyph in Sunday according to the text on the Large Santiago tablet: