Polaris seems to be the opposite of the lively moko. Both appear to be aspects of darkness, but Polaris could represent a terminal of immovability in contrast to the dodging path of the quick and fruitful moko.

The figure of moko is always 'pregnant' with new life. Mercury is bisexual, a metal which is fluid.

Having established a possible link between moko and Mercury we could guess moko is the phoneme the Polynesian heard when someone said Mercury in English:

"When a native is baptized, his patronymic often gives offense to the missionaries, and they insist upon changing to something else whatever is objectionable therein. So, when Jeremiah came to the font, and gave his name as Narmo-Nana Po-Po (something equivalent to The-Darer-of-Devils-by-Night), the reverend gentleman officiating told him, that such a heathenish appellation would never do, and a substitute must be had; at least for the devil part of it. Some highly respectable Christian appellation were then submitted, from which the candidate for admission into the church was at liberty to choose. There was Adamo (Adam), Nooar (Noah), Daveedar (David), Earcobar (James), Eorna (John), Patoora (Peter), Ereemear (Jeremiah), &c. And thus did he come to be named Jeremiah Po-Po; or, Jeremiah-in-the-Dark - which he certainly was, I fancy, as to the ridiculousness of his new cognomen."  (Herman Melville, Omoo.)

Although the distance from the first to the last moko on the back side is not 9 months we can anyhow find meaningful distances ending with moko opening her 'mouth':

638 (the glyph number for Cb10-16) - 273 (the day number for September 30) = 365. And in September 30, we should remember, the star Mimosa (192.9) rose with the Sun.

Counted from te maitaki with a dot in front (Cb7-11) the glyph distance is 638 - 547 = 91 (= 7 * 13). Possibly the 'pregnancy period' was not 9 months but 9 decades of nights.

In September 18 it was the heliacal time for π Virginis (181.0) and at the Full Moon in the night should be π Phoenicis (363.4).

Moko in Cb10-16 is still pregnant, but a birth (hanau) should be close. Looking ahead we cannot find any hanau glyph until Cb11-21, which is located 273 (alluding to September 30) days from the beginning of side b: