Dwads: (or the def's might be vice versa not sure officialy)are like this:Taurus Sign:
Taurus, -> Gemini->Cancer and so on finishing at the sign before taurus, aries. Contains 12 2.5°d Dwads.
Now duad:
Taurus Sign:
first 2.5°d is Aries-> Taurus-> gemini and finishes at pisces.
what does it take to complete a full zodiac? it takes 2 giant rings around you. the sun's daily path, and the equator. is one.
it takes 2 rings to make a zodiac. so does it make sense that 1 sign would not have a complete zodiac in it, but be it's own part. the signs aries taurus gemini all the way to end with pisces. the rings create that it is one full set. the sign aquarius is not a complete zodiac set, it is a fraction of a full set, therefore it is it's own part. it is not a full, it is just a fraction, therefore it contains it's own energy.
therefore the zodiac does not repeat in each sign, because each sign does not contain 2 giant rings which creates the zodiacs and that is what is needed for a full zodiac. each sign is a small component, and incomplete component. therefore it makes sense that it would form individual components, and not 12 more completed ones. starting from aries to pisces in each sign is like a completed zodiac, where as that does not reflect the whole because the whole is a complete circle.