A new look at 6a2 is useful at this stage:

As we just saw in Keiti GD22 (ragi) appears - here in two versions: with and without light. The 'flow' in the 3rd glyph above is completely enveloped (marks all around its perimeter) so no light emerges.

Enveloped are also the double henua (4th and 5th glyphs). Both sky and and the two earths are completely in the dark.

The curious 6th (i.e. the number of the sun) glyph - a henua with a 'knee' - is now completely understandable.

I think I will finish here and now with a first version of GD57 in my glyph dictionary.