Recent Discussions Module: Displa Avatar Replier last latest Replie

Hi StackIdeas
We are currently writing overrides to get the ED forum pages and modules ready for our template using UI Kit.
In the module ED Recent Discussions we also want to display the avatar of the last replier, analogous to displaying the avatar of the author of a recent post.

                        <?php if ($params->get('show_avatar', 1)) { ?>

                        <?php echo ED::themes()->html('user.avatar', $post->getOwner(), array('rank' => false, 'status' => true)); ?>

                        <?php } ?>

How can we display the author of the last replier in the same way?
Best regards
Christian