Does an Imam have the authority to dismiss a judge he appointed?

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There are two opinions regarding whether the Imam who appointed the judge, or a subsequent Imam, can dismiss him. One view, which is the stance of Al-Shafi'i, holds that the judge is not dismissed because the appointment was made for the benefit of the Muslims, and the Imam cannot revoke it while the judge is competent, just as he cannot unilaterally dissolve a marriage contract he entered into on behalf of a ward. The second opinion states that the Imam possesses the authority to dismiss the judge, citing the precedent of Umar dismissing Abu Maryam from the judgeship of Basra and appointing Ka'b ibn Suwar. This is further supported by the general authority of the Imam to dismiss governors and officials.