Is this morally wrong?

Yes.... It's morally wrong. Sure it's an easy cl. But each and every one of you in this cl are being cheated of learning the lessons that you're their to learn. It's up to each of you to correct him and make sure he teaches you all what you're there to learn. Tell him..... If he has memory problems, then he needs to overcome them or work around them in the future. Don't cheat yourselves......