I'm not sure how fed up with Watson they are, but my guess is they chose an option that keeps as many people around as possible.
Moving Crawford to the 60 can be done retroactively, I believe, so they could time it just about right.
Casas seems to be no closer now than a month ago, so same with him.
We could deal an everyday player to make room for a pitcher, but I think the 60 Day IL seems the most likely.