I prefer not to close comment status, but add these lines :

function sitewide_tags_get_comments_num($count)
{
global $blog_id,$wpdb,$post;

$tags_blog_id = get_site_option(‘tags_blog_id’);
if (!$tags_blog_id || $blog_id!=$tags_blog_id) return $count;
$base = $wpdb->base_prefix;
list($post_blog_id,$post_id) = explode(‘.’, $post->guid);
$r = $wpdb->get_col(“SELECT comment_count FROM $base{$post_blog_id}_posts WHERE ID=$post_id”);
if (is_array($r)) return $r[0];
return $count;
}
add_filter(‘get_comments_number’, ‘sitewide_tags_get_comments_num’);

so, your plugin will also display the correct comment number from the original post.

rizapn