Avatars for Multisite + Ada WPMU Sitewide Feed Plugin

I'm using Ada WPMU Sitewide Feed Plugin Version 0.5.2 to generate a frontpage for my multisite.

I'm constructing my 'loop' like this:

$postdata = $wpmu_sitefeed->get_data("posts");
foreach ($postdata as $pdata) {
   ...
}

This works fine, but I can't see any avatars in the $postdata so I'm trying to add those like this:

$postdata = $wpmu_sitefeed->get_data("posts");
foreach ($postdata as $pdata) {
   ...
   echo '<img src="' . $wpmu_sitefeed->ada_get_avatar_url($pdata->post_author) . '">';
   ...
}

However, then I just get the standard gravatar pulled from gravatar.com, so I guess the Ada WPMU Sitewide Feed Plugin isn't seeing the avatar I've attached to the user using the Avatars for Multisite plug-in. What plug-in should I use to get it working with the the Ada WPMU Sitewide Feed Plugin?