This glyph (Qb5-130) looks similar to Pb5-1

in that both have a strange 'tail'. Or is it just a single 'fin' that has been added at bottom right?

No, Qb5-130 has quite another 'bottom' part than the similar glyphs in the immediate surroundings. And the same goes for Pb5-1. However, there is a slight resemblance with the marked glyph Pb5-10:

Could it be that the strange 'tail' is a variant of viri (GD33)?

If this is so, then we could regard these five similarly looking glyphs as the four 'bacabs' and the central pillar. In the frame of reference of P the central pillar would be Pb5-10. In the fram of reference of Q the central pillar could be Qb5-130. In H it would be Hb2-48.

I.e. the central pillar would coincide in H and Q, and that is the point where I have decided to start my sequence 1a.

In P the central pillar is relocated from the first of the five glyphs to the third (the middle) glyph, but therefore also presented (Pb5-1) immediately before the five glyphs. The presentation in H and Q seems to be focused on the four 'bacabs' rather than on the central pillar.

Of course all this is just speculation, so far. Ideas from my imagination, where the birth of primary important gods must take place in the dark unregulated time between the years. The primary gods should be those who hold up the sky above the earth so that it will not fall down on us. One at each of the four corners and one in the middle, like a pyramid (or tent).
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