Ansom needs to purge the city from anyone who is bound to obey Stanley (Parson, Wanda Sizemore). Unless Stanley is dead, Parson will need to stay in prison or worse. I don't think it's likely Ansom will leave Parson in charge of GK. The archons can end spells, so Parson can be sent back, but that's costly so terminating Parson is probably the best option.