the zero-ing works fine,
actually I never used Joint-Editors as I hardly understand it's function.

two remarks:
the texture on the fingernails is either blue or white, while it's red in the cartoon, easy to fix in photoshop giving the texturemap red at the location  of the fingernails.

in the mask there are a few obstructive polygons that show up only when some posefiles are applied to M4