There is an old Chinese statement:

From One comes Two, and from Two comes Three. From Three everything else will then be generated.

This idea agrees with Spring measuring 3.

Toru can be imagined as to followed by a qualifying ru.

To

1. Particle sometimes used with the article in ancient legends; i uto to te hau, the ribbon was in the float. 2. To rise (of the sun) during the morning hours up to the zenith: he-to te raá. Vanaga.

1. Of. T Pau., Ta.: to, of. Mgv.: to, genitive sign. Mq.: to, of, for. 2. This, which. Churchill.

Mgv.: To, to make a canoe of planks. Mq.: to, to build a canoe. Sa.: to, to build. Churchill.

If toru is the number symbolizing 'generation', then of course to will fit as a genitive sign.

To 'make a canoe of planks' (to) makes me remember the first king, Oto Uta, because he was supposed to be taken on board but was mysteriously 'left behind':

... At the time of the loading of the emigrant canoe, Hotu Matua ordered his assistant Teke to take a (stone) figure (moai) named 'Oto Uta' on board the canoe, along with the people (aniva) who were emigrating. However, the figure was left behind 'out in the bay' ...

Oto could be O-To. And the old expression i uto to te hau (the ribbon was in the float) rings like an 'upside down' version of Oto Uta. The ribbon (te hau) was 'on board' (i uto to), but not king Oto Uta.

A float (uto) is something else than a canoe, maybe we should regard it as the opposite of a canoe. Maybe King Oto Uta must be transported on a raft and not in a canoe. A float (uto) is presumably u-to, and the added to (to build) determines that it is a float and not some other aspect of u. For the Maya indians U meant the Moon.

The sea is tai in contrast to uplands, uta. The generative sign (to) should not be down in the bay, because the qualifying Uta in king Oto Uta says so. His place is on land and in the journey of Sun he reaches 'land' in spring, arriving from the 'sea'.

A raft is a flat horizontal structure (to) of timbers, reeds, or planks, while a canoe has its boards standing on edge. If a statue was on board a canoe it would not be visible, that is the essential difference.

Spring Sun must be visible. He cannot be transported onboard a canoe. The last evidence proves the case: To means 'to rise (of the sun) during the morning hours up to the zenith: he-to te raá'.

To in toru is now known. The qualifying '-ru', what does it signify?

Ru

A chill, to shiver, to shudder, to quake; manava ru, groan. Ruru, fever, chill, to shiver, to shake, to tremble, to quiver, to vibrate, commotion, to apprehend, moved, to agitate, to strike the water, to print; manava ruru, alarm; rima ruru, to shake hands. P Pau.: ruru, to shake, to tremble. Mgv.: ru, to shiver with cold, to shake with fever, to tremble. Mq.: ú, to tremble, to quiver. Ta.: ruru, to tremble. Churchill.

Ruru, to tremble, an earthquake. Sa.: lūlū, lue, to shake. To.: luelue, to roll; lulu, to shake. Fu.: lulū, to tremble, to shake, to agitate. Niuē: luelue, to shake; lūlū, to shake, to be shaken. Nuguria: ruhe, motion of the hands in dancing; luhe henua, an earthquake. Uvea, Ha.: lu, lulu, lululu, to shake, to tremble, to flap. Fotuna: no-ruruia, to shake. Ma.: ru, ruru, to shake, an earthquake. Ta., Rarotonga, Rapanui, Pau.: ruru, to shake, to tremble. Mgv.: ru, to tremble; ruru, to shake. Mq.: uu, to shake the head in negation; uuuu, to shake up. Uvea: ue i, to shake; ueue, to move. Rapanui: ueue, to shake. Churchill 2.

It signifies 'movement'. This becomes understandable when we contemplate the opposite. To be still means to be dead. Te Kaiga (Spring) cannot be still - it must up and jump around.