Drupal Association members fund grants that make connections all over the world.
In this respect http://api.drupal.org/api/function/comment_enable/6 is wrong, but http://api.drupal.org/api/function/_comment_update_node_statistics/6 has it right.
Note that new nodes without comments have the last_comment_timestamp set to n.changed - which is the same as n.created - and this value is not updated if the node is updated.
This can all lead to incoherently ordered listings on the tracker page.
Also devel 6.x still has the page callback devel_rebuild_node_comment_statistics_page() but the menu item went in 1.248 (http://drupalcode.org/viewvc/drupal/contributions/modules/devel/devel.mo...).