Twin heads facing each other appear also in ariga erua glyphs, but the bottom part of kea glyphs is different, maybe illustrating some kind of crustacean. When Metoro said kea at this type of glyph it meant macrouse according to Bishop Jaussen (Barthel).

1. I do not know what macrouse means. In order to unravel what Metoro had in mind when he said kea a first step could be to notice that he once said pikea (= crab):

Ab6-84

ko te pikea

This kea glyph is exceptional, though, because the body is a separate entity. We can compare with a few other kea glyphs where body and 'claws' are integrated elements of the sign:

Ca2-10	Ea9-9	Gb8-1	*Ha9-52

The body of Ab6-84 could be a puo sign and in addition there is a horizontal cut across.

Maybe Metoro by his pikea indicated Ab6-84 was not a kea. Possibly the crab and other crustaceans constitute the opposite of kea - such seems often to be the idiom of word play.