It turns out extrusion is an operation that give you all the relevant pole, as extrusion introduce local curvature, that is most shape can be Created through extrusion alone.
I also find out that mesh topologies are basically define by pole, and that you essentially need mostly T poles and E poles to describe any shape topologies. Cap is the end of a segment, link are segments that bridges 2 articulation points, branch happen when there is an articulation with more than two incoming segments. I have been working on a creature creator too, i identified 3 topologic aspects on the mesh, the cap, the link and the branch. Trigonometric ik with only 3 points is the simplest, but had it to controla spline and that's enough of an approximation to a multiple segment ik. The original also use ik to target limb animation that's essentially linking a floating but animated target. The original use metaball for merging body mesh, and the scaling is done off center to get a spine line nature, the later can probably be easily implemented by not having uniform scaling of mesh by bone in the direction of the bone up. It's greatly simplified but great nonetheless because of the straightforward nature.
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