Co-authors adding extra image thumbs

I wrote this little function for functions.php to prevent the generation of these extraneous images, but it will also prevent the gravatar from generating these images. So take it for what it’s worth.

function remove_coauthors_images() {
    // Stop Co-Authors Plus from generating thumbnails
    $avatar_sizes = array(
				32,
				64,
				96,
				128
			);
    foreach( $avatar_sizes as $size ) {
        remove_image_size( 'guest-author-' . $size);
    }
}
add_action('init', 'remove_coauthors_images'); // Remove CoAuthors additional thumbnails