Sorry if I'm not following you directly! Correct me if I misunderstand.
I think a digest is basically a good idea, but I'm not sure it should be quite as detailed or complicated as you suggest. It's great for those little events that happen in threads that you miss if they aren't pointed out, but it seems like the Sunday digest post would get pretty spammy if, say, Joshua asks what everyone's favorite animal was and you recap several people answering "bunnies" and "kitties."
That or maybe for the Sunday post, just link back to the Monday post rather than reposting everything?