To me, the more important question is: Who are you getting? The improvement of your team is the purpose. If you drop Toney or Moore, and get garbage, who cares?
I would prefer Dortch over Toney. Dortch could even be a FLEX option this week.
The question is what will happen to Dortch once Rondale returns. Looks like it will take another 2-3 weeks. If your league offers an IR spot, you can stash him there. If not, drop him for Dortch. Even if he does get scooped up, I doubt you will miss him a lot this season. He will have only 2-3 games before D-Hop returns, and I don’t see him as more than the #4 target for the Cards then.