I prefer having one big post and making the directory, but also having the option to allow for bot interactions in the regular CR posts if that's what people want. Because if people do have the bots in their own posts as well it will lessen the breaking of the main post. Like say Miranda makes a post and Axel tags her there and Koko and I decide we want a bot to show up later on we can do that instead of adding to the comment count of the main post by having Miranda tag him or him tag her there, too. If that makes any sense whatsoever.
And for the directory, each of us could comment with a "text" box with links to our character's threads so they can be copypasta-ed into the main directory instead of someone having to hunt down each thread.