This pass seeded only the four tropical-sign ages with genuine independent literature discussing them individually (Taurus, Aries, Pisces and Aquarius), plus the Great Year concept row that frames the whole twelve-part cycle. Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius and Capricorn were left out rather than written thin from the same general astrological-history sources already cited for the other four.
What would resolve this A literature review of each remaining sign's astrological-age material, checking whether it has been discussed with comparable depth and citable sourcing to Nicholas Campion's treatment of Taurus, Aries, Pisces and Aquarius in A History of Western Astrology, before writing per-age entries rather than a single thin placeholder for all eight.
OpenHistory of astrology / esoteric studiesDivinity Atlas Open Questions Register, First Edition