Leo built the switch. For the first time, Grunt could scratch his head (IK for stability) and then wave goodbye (FK for fluidity) without a single pop or glitch.
Months later, "The Art Of Effective Rigging" became a cult classic on Gumroad. Leo became a contributor—he added a chapter on facial flexes and a free script for automatic toe-rolls. Gumroad - The Art Of Effective Rigging In Blender
Leo bought it.