Display the latest post from some selected authors

What you can do is the following:

http://codex.wordpress.org/Function_Reference/get_posts_by_author_sql

<?php
$where = get_posts_by_author_sql( 'post', true, $user->ID);

// get post query
global $wpdb;
$query = "SELECT ID FROM $wpdb->posts $where";
$post_ids = $wpdb->get_var( $wpdb->prepare( $query, 'Get all posts' ) );
?>

Did not try it but something simular in your case should help.

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