Thank you for a very interesting and thought provoking essay Bhante. It accords with some of my own rationalisations about aspects of the dhamma and science and I have enjoyed reading it very much.
Like @brahmali I take the 7 suns to be analogous with stages of the suns expansion and contraction as it runs out of hydrogen and begins to expand into a red giant before eventually becoming a white dwarf star in about 5 billion years time. There are a number of stages involved in that process and from memory it was around 7 in number.
I had already thought something similar after stumbling across the 7 suns sutta and like brahmali I was struck by how similar it was to modern understanding of how the sun will eventually die. A very thought provoking article that resonates quite strongly with me.