<p>I didn't really think much of Minerva McGonagall being there so early. It could be retconn of her story. We will have to wait and see.</p><p>
</p><p>As for Credence being a Dumbledore. We can't rule anything out yet and SHOULD NOT jump to conclusions. We are only on the second movie. There is no way of knowing if it's actually some well kept secret of the Dumbledores or if Grindelwald is manipulating him with lies again. We will have to WAIT and SEE.</p>