Here we need to stop for a while. The glyph type in Qb2-16 I have named hakaua:

side b			side a	side b
		72	226
Gb6-17 (1)				Ga8-23 (227)
		144	452
Qb5-17 (1)	Qb5-18			Qb2-15 (453)	Qb2-16
300

Hakaua means 'making rain', I think. But hakauaua is to 'mark with lines':

Ûa Rain; 1. ûa hakamito, persistent, but not strong, rain; 2. ûa kura, fine rain, drizzle; 3. ûa matavaravara, strong rain; 4. ûa parera, torrential rain; 5. ûa tai, rain followed by fair weather at sea. Ehu ûa, drizzle. Vanaga. Ûaûa. Tendons, muscles. 1. Hau ûaûa kio'e, line made from rats' tendons. 2. Ûaûa toto, vein, artery. 3. Ûaûa piki, spasm. Vanaga. 1. Rain; hoa mai te ua, to rain; mou te ua, to cease raining. P Mgv., Mq., Ta.: ua, rain. 2. Vein, artery, tendon (huahua 1) (uha G); ua nene, pulse; ua nohototo, artery, ua gaei, pulse. Uaua, vein, tendon, line; kiko uaua, muscle T. Hakauaua, to mark with lines. P Pau.: tare-ua, tendon. Mgv., Mq., Ta.: uaua, vein, tendon. Churchill

Maybe we should see the hakaua glyph type as the opposite of the tamaiti glyph type, 'death' contra 'birth' (or young without wrinkles contra old with wrinkles):

Hau ûaûa kio'e is a line made from rat's tendons. Vertical lines are used in rongorongo to indicate where there are border lines in the text. The 'rat' is the sun.

From there it is not hard to find a similarity with Rogo:

In Qb2-22 there is a tamaiti:

The day after somebody is leaving. First a new baby is born, then the old one goes away (295 days from winter solstice according to G):

side b			side a	side b
		63	230
Gb6-26 (1)				Gb1-1 (231)
		126	460
*Qb5-35 (1)	*Qb5-36			Qb2-23	Qb2-24 (462)
295

The pair of ika hiku glyphs possibly defines by way of hakaua that the event has been reached, and by haati that it is over:

The 'bulb' in form of the lower half of hakaua transforms into the upside down upper half of haati.

5 days are needed for the transformation. First sun will have used up his 300 days counted from the onset of winter solstice (*Qb5-17), then he has left 295 days counted from *Qb5-35.

But before he leaves, he has a baby delivered: