We can pretend Leonie and I had a four month long discussion, right? xD
As far as posting in previous RPotMs, we decided on a small change - RPotM posts are worth 2 activity points during the month they are posted for (so we'll see that change when the next topic comes around in April). Once the month is over, the RPotM will become a regular topic, and any further posts will count as regular 1 activity point posts.
So everyone is more than welcome to post in prior RPotMs (which for now is just the Hogwarts Express/Sorting one), if they'd like to explore that topic further.