I wonder if Pietersen would convert back her position Groutheus is doing as good as Stam as a defensive OH so giving Plak is better idea. However, Wensink is only one year older than Steenbergen and I believe a fully recovered Wensink still has so many things to contribute NT, also Belien didn't seem to be a special talent whenever she entered to the game.
Pietersen has played many years as OPP now, I would be very surprised to see her as MB again...
I agree that Wensink could help a lot, but really only if she fully recovers.
Belien plays very well in Aachen, she turned 20 just last month so of course she needs more time, but she has good potential in all elements.