Hmm you should be able to display some content only after the first posts by adding a if in the topic.tpl. For example on this line https://github.com/NodeBB/nodebb-theme-persona/blob/master/templates/topic.tpl#L74
You can add
{{{ if !posts.index }}} only visible on main post {{{ end }}}Since the main posts has an index of 0, that content will only show in the main post.
