All of this begs the question of who could/would be removed from the 40-man if they decide they need to make room for the likes of Sappelt, Dorn or Frazier. I'd have to think that Philippe Valiquette is at risk. His value is derived from being a lefty reliever who throws hard. Well, there's Chapman (who, granted, will likely not remain in the bullpen long-term). And there's Joseph, who almost certainly ranks ahead of Valiquette as a prospect. Even Horst, Krebs and Herrera, while not hard throwers, have historically been more productive. If the Reds expect Mace Thurman to regain his health (not sure what his issue is), he's probably in the equation, too.
For that matter, Herrera is another who might be considered expendable. Burton, as well. And lastly, Del Rosario. I suppose there's also the possibility of Edmonds going on the 60-day.