Why?
It is simple logic that if a statement or belief is disputed to the extent that it requires an actual defense, rather than simply being re-taught, it is because such a belief is inherently illogical or flawed, or both.
But since you're so insistent I'll go with one of the most obvious problems;
Maitreya will not return until Shakyamuni Buddha's entire corpus of teachings is not only corrupted, but completely forgotten. Bahá'u'lláh claimed to be Maitreya despite the fact that we still have all of Buddha's teachings, sure there may have been many additions and some might say corruptions, but the Four Noble Truths and the Eight-fold Path stand complete in all traditions irrespective of their sectarian beliefs.
Now, I'm fine with you believing that Bahá'u'lláh was Maitreya, doesn't concern me at all. But since you're now going to have to jump through some pretty poorly constructed hoops in an attempt to gel Buddhist "prophecy" with your own beliefs is just going exemplify my opinion on apologetics.
It is far beyond Bruce's grasp or mine to get you to interpret anything.
As to the claim. The actual wording is this:
"
Having surrendered unreservedly to Gods summons, He was equally in no doubt about the role which He had been called upon to play in human history. As the Manifestation of God to the age of fulfillment, He is the one promised in all the scriptures of the past, the Desire of all nations, the King of Glory. To Judaism He is Lord of Hosts; to Christianity, the Return of Christ in the glory of the Father; to Islam, the Great Announcement; to Buddhism, the Maitreya Buddha; to Hinduism, the new incarnation of Krishna; to Zoroastrianism, the advent of
Sháh-Bahrám.
4 "
and the footnote is this:
"
4.
God Passes By, pp. 9496.
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and the source reads;
'
"He Who in such dramatic circumstances was made to sustain the overpowering weight of so glorious a Mission was none other than the One Whom posterity will acclaim, and Whom innumerable followers already recognize, as the Judge, the Lawgiver and Redeemer of all mankind, as the Organizer of the entire planet, as the Unifier of the children of men, as the Inaugurator of the long-awaited millennium, as the Originator of a new Universal Cycle, as the Establisher of the Most Great Peace, as the Fountain of the Most Great Justice, as the Proclaimer of the coming of age of the entire 94 human race, as the Creator of a new World Order, and as the Inspirer and Founder of a world civilization.
To Israel He was neither more nor less than the incarnation of the Everlasting Father, the Lord of Hosts come down with ten thousands of saints; to Christendom Christ returned in the glory of the Father, to
Shíah Islám the return of the Imám Ḥusayn; to Sunní Islám the descent of the Spirit of God (Jesus Christ); to the Zoroastrians the promised
Sháh-Bahrám; to the Hindus the reincarnation of Krishna; to the Buddhists the fifth Buddha.
In the name He bore He combined those of the Imám Ḥusayn, the most illustrious of the successors of the Apostle of Godthe brightest star shining in the crown mentioned in the Revelation of St. Johnand of the Imám Alí, the Commander of the Faithful, the second of the two witnesses extolled in that same Book. He was formally designated Baháulláh, an appellation specifically recorded in the Persian Bayán, signifying at once the glory, the light and the splendor of God, and was styled the Lord of Lords, the Most Great Name, the Ancient Beauty, the Pen of the Most High, the Hidden Name, the Preserved Treasure, He Whom God will make manifest, the Most Great Light, the All-Highest Horizon, the Most Great Ocean, the Supreme Heaven, the Pre-Existent Root, the Self-Subsistent, the Day-Star of the Universe, the Great Announcement, the Speaker on Sinai, the Sifter of Men, the Wronged One of the World, the Desire of the Nations, the Lord of the Covenant, the Tree beyond which there is no passing. He derived His descent, on the one hand, from Abraham (the Father of the Faithful) through his wife Katurah, and on the other from Zoroaster, as well as from Yazdigird, the last king of the Sásáníyán dynasty. He was moreover a descendant of Jesse, and belonged, through His father, Mírzá Abbás, better known as Mírzá Buzurga nobleman closely associated with the ministerial circles of the Court of Fatḥ-Alí
Sháhto one of the most ancient and renowned families of Mázindarán. "
The words were written by Shoghi Effendi, not Baha'u'llah--though Shoghi Effendi did not provide a translation of the source he was using as a reference.
Shoghi Effendi was the second and LAST person to have been granted the right to interpret the writings.
I do not know what the original statement was, nor does anyone other than perhaps the scholars at he Research Department in Haifa. You can inquire there, questions are welcome from anyone.
Regards,
Scott