What can the pure sign in Ka3-7 mean?

Ka3-1	Ka3-2	Ka3-3	Ka3-4	Ka3-5	Ka3-6	Ka3-7
Ga2-13	Ga2-14	Ga2-15	Ga2-16	Ga2-17	Ga2-18	Ga2-19

In analogy with how in the Mamari moon calendar the 'moon fish' glyphs indicate rising (waxing) and falling (waning) the red-marked glyphs above probably indicate how the 'sun fish' is waxing and waning.

If so, then - at the end - signs of spirithood are reasonable to expect.