It's a fresh waiver, so they would need to add him to the 40-man like any other team. He has a minor league option remaining, so if they simply want to put him in AAA they can. But, if they want to again remove him from the 40-man, they would need to put him on waivers again, and I think doing it* a second time has additional ramifications such as allowing him to choose free agency. Which, if he was fed up enough, he just might. * Actually, Designated For Assignment, which is closely tied, but this note has become too long already