It is evident that the term "the first" to recognize Bahá'u'lláh had different meanings according to the context of its use. For example, given 'Abdu'l-Bahá's designation as "the Mystery of God" and His unique relationship with His Father, it is possible that the reference is to the spiritual realm, a realm which transcends time. While, in the case of Mírzá Áqá Ján and Shaykh Hasán-i-Zunúzi, the application of the term is necessarily in the context of the human plane of existence.
In relation to Mírzá Áqá Ján, Shoghi Effendi in "God Passes By", p. 115, clearly affirms that Mírzá Áqá Ján was "the first to believe" in Bahá'u'lláh, and that to him, Bahá'u'lláh, more than to anyone else, was moved to disclose, at this critical juncture, a glimpse of the as yet unrevealed glory of His station.
Hence, one possible distinction between Mírzá Áqá Ján and Shaykh Hasán-i-Zunúzi could well relate to the degree or extent of their recognition, with primacy being accorded to Mírzá Áqá Ján.
(Memorandum from the Research Department of the Universal House of Justice dated 23 May 1991, attached to a letter dated 20 June 1991, written on behalf of the Universal House of Justice to an individual believer; Baha’i Online Library)
