>>9288140I'll agree about the forward torso movement, which, honestly is just weird how this still hasn't been dealt with, but the 'diapers' really aren't stiff. Very few figures that have the diaper can't easily hit 90 degrees forward by just pushing them a bit, it isn't going to break.
Obviously we don't have the figures in-hand yet, but looking at them, I don't think anything is going to be hindered. Even their waist ball looks to have more space than most, so forward crunch at least at the lower ball should be pretty decent.