I have Moon in Saggittarius,indeed in the 8th house, that's why I really don't find this subject "forbidden". Also got well placed Pluto.
Getting to the bottom of things is my favorite mind game
We all know astrology can indeed tell you anything that your soul was set to do.
If you think just death wasn't indicated, cause it's death it doesn't make sense.
Of course you can't predict outer influences, so It's possible that I die before that date. It can't be 100% prediction.
I understand,that each of these aspects alone wouldn't be indicator,but all together you get the picature. With all these alignments together it would be hard for me to imagine I just broke a bone. Surely doesn't look like I will be having some nice cosmetic procedure with that Chiron, It could as well indicate some extreme moment I survive in the end, but I believe it will be a crucial moment anyways.
I don't know about the three stages, will look into it, but the natal chart is in complete sync with the "karma" of a person,so let's say it is true for having three doors throughout your life, you will probably have at least three indicating dates, but one will probably happen to be calculated after you are done with your "mission" and it would be most obviously shown.
Having it after 30, when we have most likely acomplished our main soul "goals" could very well show that you are ready to go.
Parts and Points are the "cherry of the cake".