End-Time reformer? So the final reformer?
Peace be on you.
1-Theoretically, many can come.
2-On the level of prophesy, Promised Messiah -- the Mahdi is mentioned, as follower of Holy Prophet (pbuh) according to Ahmadiyya-Muslims.
3-Holy Prophet (pbuh) was like Hazrat Moses (a.s.) :
[Quran ch 73:v 16] Verily, We have sent to you a Messenger, who is a witness over you, even as We sent a Messenger to Pharaoh.
Both Prophets with Jalal [grandeur, sun-like property, fast] --- Both have their Messiahs; Both with Jamal [beauty, calm, moon-like property, slow process] --- Thus End-Time reformer has steadiness in spread, His Khilafat continues, it is like a process. End-Reformer's time will be at least 1000 years.
"That the history of religion is cyclic and is renewed every seven millennia. The present cycle from the time of the
Biblical Adam is split into seven epochs or ages, parallel to the seven days of the week, with periods for light and darkness. Mirza Ghulam Ahmad appeared as the promised Messiah at the sixth epoch heralding the seventh and final age of mankind,
[64] as a day in the estimation of God is like a thousand years of man's reckoning.[
Quran 22:47] According to Ghulam Ahmad, just as the sixth day of the week is reserved for
Jumu'ah (congregational prayers), likewise his age is destined for a global assembling of mankind in which the world is to unite under one universal religion: Islam."
Ref:
https://en.wikipedia.org/wiki/Ahmadiyya