Alright Alpha,
If you want me to start right here, fine by me!
Quran and the prophecies of Reform among the Ummah:
048.028
YUSUFALI: It is He Who has sent His Messenger with Guidance and the Religion of Truth, to proclaim it over all religion: and enough is Allah for a Witness.
009.033
YUSUFALI: It is He Who hath sent His Messenger with guidance and the Religion of Truth, to proclaim it over all religion, even though the Pagans may detest (it).
061.009
YUSUFALI: It is He Who has sent His Messenger with Guidance and the Religion of Truth, that he may proclaim it over all religion, even though the Pagans may detest (it).
You will say, it does not prove that any other person will revive the religion, its just a promise... But lets see
062.002
YUSUFALI: It is He Who has sent amongst the Unlettered a messenger from among themselves, to rehearse to them His Signs, to sanctify them, and to instruct them in Scripture and Wisdom,- although they had been, before, in manifest error;-
062.003
YUSUFALI: As well as (to confer all these benefits upon)others of them, who have not already joined them : And He is exalted in Might, Wise.
062.004
YUSUFALI: Such is the Bounty of Allah, which He bestows on whom He will: and Allah is the Lord of the highest bounty.
Here is a Bukhari Hadith on the commentary of last three verses i have quoted:
Volume 6, Book 60, Number 420:
Narrated Abu Huraira:
While we were sitting with the Prophet Surat Al-Jumu'a was revealed to him, and when the Verse, "And He (Allah) has sent him (Muhammad) also to other (Muslims).....' (62.3) was recited by the Prophet, I said, "Who are they, O Allah's Apostle?" The Prophet did not reply till I repeated my question thrice. At that time, Salman Al-Farisi was with us. So Allah's Apostle put his hand on Salman, saying, "If Faith were at (the place of) Ath-Thuraiya (pleiades, the highest star), even then (some men or man from these people (i.e. Salman's folk) would attain it."
Ahadith on Isa and Mahdi being the same and from the Ummah:
Bukhari: Volume 3, Book 34, Number 425:
Narrated Abu Huraira:
Allah's Apostle said, "By Him in Whose Hands my soul is, son of Mary (Jesus) will shortly descend amongst you people (Muslims) as a just ruler and will break the Cross and kill the pig and abolish the Jizya (a tax taken from the non-Muslims, who are in the protection, of the Muslim government). Then there will be abundance of money and no-body will accept charitable gifts.
“The Mahdi is none other than the Messiah, the son of Mary.” Sunan Ibn Majah (4039)
Sahih Muslim: Book 001, Number 0292:
It is narrated on the authority of Abu Huraira that the Messenger of Allah (may peace be upon him) observed: What would you do when the son of Mary would descend amongst you and would lead you as one amongst you? Ibn Abi Dhi'b on the authority of Abu Huraira narrated: Your leader amongst you. Ibn Abi Dhi'b said: Do you know what the words:" He would lead as one amongst you" mean? I said: Explain these to me. He said: He would lead you according to the Book of your: Lord (hallowed be He and most exalted) and the Sunnah of your Apostle (may peace be upon him).
This is Quran and Hadith, Contrary to your views that, a massiah will physically descend upon mankind.