Carpenter's defense has been pretty bad at second base this season, for what it's worth.
Bad enough that he's a minus-7 in defensive runs saved in a little over 200 innings there.
That was part of the concern about playing him there, at least for me.
I do think Edman is capable of bouncing around and if he was on a deeper team that very well could be the best role for him, starting regularly but in a different spot often. The Cardinals are not that kind of team at the moment though. Could be in the future, perhaps. Edman's a good player, a versatile player. I think the Cards have asked too much of him this season offensively, but not defensively. He's flexible out there.
My thoughts on Bader are back to where they were when the season started, more or less. He's an every-day starter if you value defense first in center field, and if you have a lineup that can do what he can't around him -- because he's that good in the outfield. But the Cardinals are in a jam because they don't have that kind of an offense. So they wrestle with what to do with Bader. And will continue to until they make a change or enhance the offense around him. The hope for this season was he would be a bigger part of the offense. That looked promising for a while but not so much at the moment.
DeJong is a better hitter than he's shown this season. He's not a cleanup hitter like the Cardinals hoped. Maybe it's time for a change, but don't be surprised if he bounces back elsewhere. Again, the Cardinals need to take a long, hard look at why they haven't been able to crack the code with the shortstop. It's a big problem for the team until it gets fixed, even if DeJong is shipped out.