I will just share my thoughts and hope you are willing to see i am trying, in my own way, to understand buddha-dhamma. If you cannot respect this, so be it.
By a stable element i mean a stable element, an unconditioned element, an element which was never born, does not change in the meantime and does not end. I am convinced such an element is present, and it is not an illusion.
Like Udana 8.3 explains, if there would not be this unconditioned element, no escape from the conditioned could be known or realised. How would we able to make a refuge/island of ourselves if there was not this always present stabel unconditioned element?
This unconditioned element is, i belief, the stable element present in any living being. It is the base, the essence, the ground of any living being. It is always present but not seen because of our obsession and identification with conditioned phenomena.
It is best seen when conditioned processes end. I think, when one experiences this cessation ones asava’s can end immediately. This is because one has seen there is nothing to attach too and one is safe from beginningless time.
Siebe