That last post? Yeah, please disregard the whole thing. Let this be a lesson for me. Always check and double check and even triple check because when you're dealing with a house this old and this poorly constructed it's a bottomless pit of "Oh Shit".
I'm going to have to take the whole porch apart and do it all over again. I won't go into specifics yet because I want to do a whole series of posts on this remodel but suffice it to say that as I was tearing off the old siding and the aluminum ceiling I found stuff that has completely changed how I'm going to anchor the porch roof. It all has to come down. The only thing I don't have to re-do is the corner post.
Sigh. Live and learn.