It might be felt that the appointment of one ambassador depends upon the recommendation of his predecessor to the Imam or with a consensus of the Shia scholars or clergy. As the previous one appoints the new one. Such an air of conception hangs around the third ambassador Husayn Bin Rooh. But, the reality is something else. It is the direct choice of the Imam himself; an immediate selection by himself alone.
It was not a contract or agreement between the persons or parties. Since the man was appointed by the person of Imam Mahdi himself, the appointed one was highly respected and revered among the people - commons and dignitaries. It was a commonly known fact that the ambassador was the Imam’s choice and in contact with him. Had it been otherwise, such men of repute such as Abu Suhail Nou Bakhti, Ibn Mateel, Hasan Bin Jana Nasibi would have disputed and never obeyed the ambassador.