So counting that both comments to a log and comments to a post should count as AC, why should comments to a log count as "one post for the month" while comments to an entry not? Or do you think that both should count as "posts for the month"?

Right now whoever participates in a log/entry has that count for over all AC. But commenting to an entry (when it isn't joint) does not count as a character having an entry, which is why they wind up on the thread count posts. I assumed having a character comment to a log (when it isn't joint) wouldn't count for a post either!