Two extremes threaten the discussion: eliminating any meaningful human choice, or making the servant an independent creator in an effort to defend divine justice. Each overlooks a different part of the issue.
Divine creation concerns the existence of an act; human acquisition concerns its voluntary attribution; and religious judgment concerns whether the act is obedience or disobedience. Confusion arises when one relation is mistaken for another.
The intended account preserves human responsibility without placing an independent creator alongside God.