I prefer posting answers on the board because Google sweeps the posts, and you never know when what we are discussing might be of use to some other researcher (maybe Shackets or St. Cyrs).
The next time I get to the AFGS, I will look up these people and see what I find.
Have you had any luck with Peter Alzine's death record or obituary or church burial information?
It seems unlikely the Mary A. you are chasing and my Mary Anne are the same. Mine was having children named Tredo between 1857 and 1869, making it difficult for her to have been married to Jenners when Peter Alzine was born in 1866. Unless they were never married...