I don't know. What do you believe that
office was? Do you believe that Mirza Ghulam Ahmad held that office?
Proclamation
In his early writings, the Báb appears to identify himself as the gate (
báb) to the
Hidden Twelfth Imam, and later begins explicitly to proclaim his station as that of the Hidden Imam and a new messenger from God.
[18] Rather than being a discontinued or evolving consciousness, Saiedi states that the works of the Báb are unitary throughout, and that the gradual disclosure of the Báb's identity is defined by the principle of unity in diversity.
[18]
In the Báb's early writings, the exalted identity he was claiming was unmistakable, but because of the reception of the people, his writings appear to convey the impression that he is only the gate to the Hidden Twelfth Imam.
[18] To his circle of early believers, the Báb was equivocal about his exact status, gradually confiding in them as not merely a gate to the Hidden Imam, but the Manifestation of the Hidden Imam and the Qa'im himself.
[19] During his early meetings with Mullá Husayn, the Báb described himself as the Master and the Promised One. He did not consider himself as simply Kazim Rashti's successor, but claimed a prophetic status, a kind of deputy, delegated not just by the Hidden Imam but through Divine authority.
[4] His early texts such as the
"Commentary on the Surih of Joseph" used
Quranic language that implied divine authority and identified himself effectively with the Imam.
[10][20] When Mullá ʻAlí Basṭámí, the second Letter of the Living, was put on trial in
Baghdad for preaching about the Báb, clerics studied the "Commentary on the Surih of Joseph," recognized in it a claim to divine revelation, and quoted from it in opposition to prove he had done so.
[20]
However, in the early phase of his declaration to the public, the title
báb was emphasized as that of the gate leading to the Hidden Imam, as the Báb had told his early believers not to fully disclose his claims or reveal his name.
[21] The approach of laying claim to a lower position was intended to create a sense of anticipation for the appearance of the Hidden Imam, as well to avoid persecution and imprisonment, because a public proclamation of
mahdi status could bring a swift penalty of death.
[21] After a couple of months, as the Báb observed further acceptance and readiness among his believers and the public, he gradually shifted his public claim to that of the Hidden Imam.
[21] Then in his final years he publicly claimed to be a
Manifestation of God. In his
trial, he boldly proclaimed himself, in the presence of the Heir to the Throne of
Persia and other notables, the Promised One.
[21][22] Finally, in his last authored work, the Haykal al-din,
[23] he claimed the "essence of God", dhātu'llāh.
[24] In the early months of his public declarations, the adoption of a cautious policy had essentially achieved maximum attention with minimum controversy.
[21]
However, the gradual unfolding of his claims caused some confusion, both among the public and for some of his believers. A number of his early followers had instantly recognized his station as a messenger from God with divine authority, and this resulted in disagreement within the Bábi community.
[21] Even though the Báb had intended to convey his message with discretion, many of his followers such as
Táhirih openly declared the coming of the promised Hidden Imam and Mahdi.
[21]
https://en.wikipedia.org/wiki/Bab