The crotch issue has do to with the weighting of the verts. Fixing something like this with envelopes can be a pain, but a few minutes with a weight table should fix it no prob. I don't know if the AV rig uses envelopes, weights, or some mix of the two.
The mesh itself doesn't necessarily need more geometry. Rather, some edge-loops in the shoulders, elbows, and knees would be great. The bulk of the torso and face have some good loops - why not in the major joints?
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