phloo I don't know if re-ordering posts is a good idea.
Flarum is a bit complicated in that regard, because posts are ordered by date, while some other features are based on post numbers.
It's possible that somehow the last post number is memorized somewhere, and since it's lower than some posts before it, there could be some issues.
This extension won't update the cached "first post" and "last post" attributes of discussions, so changing dates will lead to some inconsistencies if the post order changes.
