No, I am not convinced. At Ga5-10 a reversal has occurred:

 

Ga5-4	Ga5-5	Ga5-6	Ga5-7	Ga5-8 (118)	Ga5-9
Ga5-10 (120)	Ga5-11	Ga5-12	Ga5-13 (123)	Ga5-14	Ga5-15 (125)	Ga5-16

There is a viri at Ga5-11. And in Ga5-15 (5 * 15 = 75) an important event takes place. In the Mamari moon calendar a similar glyph arrives in Ca6-24, at the 'dawn' of the month:

Ca6-17	Ca6-18	Ca6-19	Ca6-20	Ca6-21
Ca6-22	Ca6-23	Ca6-24

Ga5-13 looks like Nga Kope Ririva. Though it is designed with the 'odd ball' at the top instead of at bottom:

	53
Ga5-13		Ga7-8
123		177

53, we know, probably is a sign of the darkest of times. In Saturday, e.g., a break occurs at 9-53, then comes hua poporo with a little 'egg' at bottom (quite like that in Ga5-8)

Another example is *Kb2-15:

And very clearly stated:

3			53			520		752
	Aa8-30	Aa8-31		Aa8-85	Ab1-1		Ab7-26		Aa8-26
2 * 29				522 = 18 * 29			754 = 26 * 29

And in G:

Many other instances could be referred to.

Therefore I guess Ga5-13 is the beginning of the end of the light season in some meaning.

						53
Ga5-8 (118)	Ga5-9	Ga5-10 (120)	Ga5-11	Ga5-12	Ga5-13 (123)		Ga7-8
1	2	3	4	5	6		59

Nga Kope Ririva at Ga7-8 is outside the island proper. Therefore the glyph is the vertical reversal of Ga5-13. The same situation as we have seen at the beginning of Te Pei.

But a horizontal reversal has occurred earlier:

Ga5-5	Ga5-6	Ga5-7	Ga5-8 (118)	Ga5-9	Ga5-10 (120)
1	2	3	4	5	6

It is finished at 120, which indicates sun (e.g. as 6 * 20). The vertical reversal is finished at 59, which indicates the moon. We have a double reversal, telling about what happens to the sun (spatial, horizontal) and at what time it happens (temporal, vertical).

Judging from Ga5-7 it is the sun who reappears, and it happens around 4 * 29.5 = 118 days from the beginning of the calendar. Maybe we should deduct 59 days because they may lie in the preceding year.

If we put the 59 first glyphs (counted from Ga1-1) to the preceding year, then Ga5-8 will arrive symmetrically 59 glyphs later, and Te Puoko Uri becomes the generator of the new year:

	57			57
Ga1-1		Ga2-29 (59)	Ga3-1 (60)		Ga5-8 (118)

With 4 lunar months centered in winter, the concept from Hawaii (of how the day is divided) is seen also in G. We should then expect 3 solar doublemonths centered in summer. 4 + 2* 3 = 10.

Vaitu nui is followed by Vaitu potu. And Hora iti is followed by Hora nui. The great (nui) vai comes before the little (potu) vai, but the sunny side (hora) is like a mirror image - nui comes after iti. Sun and moon behave like mirror images.

Poko uri sounds like potu uri, and comes after the great Puoko uri. We are in waterland.