1. The brightest star of Hydra is Alphard:

At Heuheu is was noted that this star was the 5th among the 10 in the Tahitian list:

... 10 implies a division in twice 5 (the number of fingers). Ana-heu-heu-po is a special case because it is number 5 (half 10). Its current right ascension tells us Alphard should be at Ga3-19:

... Such a glyph as Ga3-19 has the 'climber' (a personfication of Spring Sun) at left, which probably means he is not present but 'on the back side of earth':

Sirrah (?) 67 Ana-muri (?) 18 Ana-varu (?)
Gb6-25 Gb6-26 (*1) Ga1-3 (4) Ga1-4 (*69) Ga1-23 (24) Ga1-24 (*89)
26 Ana-tahua-vahine (?) 24 Ana-heu-heu-po (?)
Ga2-21 (*116) Ga2-22 (53) Ga3-18 (78) Ga3-19 (*143)
24 Ana-tipu (?)
Ga4-20 (*168) Ga4-21 (105)

The 5th (as in 'fire')  henua period comes in Ga3-20 and the preceding period (with Alphard) seems to represent the last period 'in the dark', before a new light is created.

The curious bird couple in Ga3-18 could be a reference to midsummer, it was suggested at The Arrow of Time:

... Possibly the hole in the center between the birds illustrates the elevated sky roof apex of midsummer high above a similarly formed earth hill. 31 * 8 = 248 ...

Ana-tahua-vahine-o-toa-te-manava is Procyon and Ana-heu-heu-po is Alphard, the 7th respectively the 5th star pillars:

1

Ana-mua, entrance pillar

Antares, α Scorpii

-26° 19'  16h 26

2

Ana-muri, rear pillar (at the foot of which was the place for tattooing)

Aldebaran, α Tauri

16° 25'  04h 33

3

Ana-roto, middle pillar

Spica, α Virginis

-10° 54'  13h 23

4

Ana-tipu, upper-side-pillar (where the guards stood)

Dubhe, α Ursae Majoris

62° 01'  11h 01

5

Ana-heu-heu-po, the pillar where debates were held

Alphard, α Hydrae

-08° 26'  09h 25

6

Ana-tahua-taata-metua-te-tupu-mavae, a pillar to stand by

Arcturus, α Bootis

19° 27'  14h 13

7

Ana-tahua-vahine-o-toa-te-manava, pillar for elocution

Procyon, α Canis Minoris

05° 21'  07h 37

8

Ana-varu, pillar to sit by

Betelgeuse, α Orionis

07° 24'  05h 52

9

Ana-iva, pillar of exit

Phakt, α Columbae

34° 06'  05h 38

10

Ana-nia, pillar-to-fish-by

North Star, α Ursae Minoris

89° 02'  01h 49

There are at least 2 common denominators, first of all the obvious Sign of talking. Why should there be so much talk? I guess Alphard is a male figure and Procyon (the little dog) is a female, that could be enough reason for discussions, cfr at Heuheu:

... In the sky roof Hydra is a long constellation 'below the the belt' (south of the equator) and medieval painters tended to picture the Serpent of Eden as a female in a vain attempt from the Church to hide the obvious resemblance to a penis. But when Sun has reached his full stature he is ready to be initiated into the mystery of life as expressed by the other sex ...

The other common denominator is the fact that 5 alludes to 'fire' (Sun in the sky, daylight) and 7 to 'earth'. 5 + 7 = 12. Yet, the order of right ascension time says 7 (Procyon) is rising helicacally 27 days earlier than 5 (Alphard):

Ga2-21 (52) Ga2-22 Ga2-23 Ga2-24 Ga2-25 (*120) Ga2-26
Procyon (115.9) σ Gemini, Pollux (117.2) Azmidiske (118.4)     ω Cancri (121.4)
period 1 : 1 Rogo Mauri Mutu
Ga2-27 (*122) Ga2-28 Ga2-29 (60)
Naos (122.3) Heap of Fuel (123.1) Tegmine (124.3)
Sand is returned to the beach from the sea.
period 1 : 2
Ga3-1 Ga3-2 Ga3-3 Ga3-4 (64) Ga3-5
Al Tarf (125.3) Bright Fire (126.4) ο Ursa Majoris (128.4) θ Cancri (129.2)
period 2
Ga3-6 (*130) Ga3-7 Ga3-8 (68) Ga3-9
η Cancri (129.5), π¹ Ursa Majoris (130.6) Museida (130.9), Beehive (131.4) Ascellus Borealis (131.9), Ascellus Australis (132.4) ι Cancri (133.0)
period 3:1
Ga3-10 Ga3-11 Ga3-12 Ga3-13 (73)
    Acubens, Talitha Borealis (136.0) ρ Ursa Majoris (136.6), ν Cancri (137.0), Talitha Australis (137.1)
period 3:2
Ga3-14 Ga3-15 (75) Ga3-16 (*140)
σ¹ Ursa Majoris (138.0), κ Cancri (138.3), Alsuhail (138.5) σ² Ursa Majoris (138.6), τ (2 stars) Ursa Majoris (138.7), ξ Cancri (138.8) Miaplacidus (140.3)
period 4
Ga3-17 (77) Ga3-18 Ga3-19 (*143)
Tureis (140.8) Al Minhar al Asad (142.6) Alphard (143.3)

period 4

Tureis

ε Carinae 1.86 59° 03′ S 09h 15m 140.8 548.8

Al Minhar al Asad

κ Leonis 4.47 26° 11′ N 09h 22m 142.6 550.6

Alphard

α Hydrae 1.99 08° 26′ S 09h 25m 143.3 551.3