To resolve the issue where the IK rig control on bones above the path is not functioning as expected, you should ensure that the constraints are applied in the correct order. The path constraint should be applied before the IK constraint. This means you need to reorder the constraints in the tree so that the path constraint is calculated first, followed by the IK constraint. This order ensures that the path positions the bones correctly before the IK constraint adjusts them. Additionally, make sure that the rotate and translate mixes on your path constraint are set to 100% to allow the path to influence the bones fully.
If the IK target is a child of a bone affected by the path constraint, consider moving the IK target to be a child of the root bone to avoid any hierarchy issues that might affect the IK behavior.
