With offsetting the limbs you mean, offset the timing of the keys?
The lower body is supposed to rotate a bit, shifting the weight more to the right leg.
The shadow is currently part of the foot image. Splitting that up will probably already be a big win.
Currently you can use the pose tool to position a chain of joints where the parent position stays fixed.
For this character the designer wanted to lock the feet and rotate the pelvis (parent of the upper legs and spine). Would it be possible to invert the pose tool so the child node would become the fixed node?