First, there is nothing that is independent and working all by itself in a birth chart. Everything symbolized in a birth chart is a functional whole that reflects the ongoing evolutionary intentions and karma of any given Soul.
Thus, relative to your questions, it is first essential to understand the evolutionary paradigm in any given chart that then serves as the foundation within that chart upon and through which all the symbols in the total birth chart are related, and correctly understood. The evolutionary paradigm is the individual 'context' through which to understand all the symbols in any given birth chart.
Archetypes have a spectrum of possibilities within the totality of the archetypes themselves. To understand the evolutionary context is thus to understand the specific prism within that totality of the archetypes that the Soul is choosing to focus upon for it's evolutionary needs.
So in your example of a Sagittarius Ascendant, the location of it's planetary ruler, aspects to it, the house that Aries is on, and the location of it's planetary ruler and aspects to it all WORK AS ONE in the individual evolutionary context of the birth chart that supports the evolutionary intentions of the Soul. Aries, in essence, correlates to a new evolutionary cycle of development with the necessary archetypes to actualize it as symbolized in the totality of the example that you have cited.
Please feel free to ask more about this if you so desire.
God Bless, Rad
Thank you for you response (and apologies for the delay in mine).
I guess what I am asking about more is how do you integrate the the sign/house/planet and aspects, etc. so that they work as one? How do you string it all together?
From what I have read, I have come to the understanding that the sign on a house cusp correlates to how consciousness is orientated (attuned) to that particular area, and that the ruling planet along with its own sign/house placement and aspects, acts as facilitator of these energies and demonstrates how that particular archetype is expressed.
I understand that all these needs to be interwoven within the evolutionary context as symbolised by Pluto and the nodal axis, etc. but I am approaching this question from perspective of understanding how this is all integrated together in the first place.
Thank you again.