Deobandis believe that if any prophet was to come after Rasūlallah ﷺ, it would not affect his ﷺ's Finality.
Usmans main argument against this was that it is just a hypothetical
Then he gave examples from ahaadeeth and Ala hazrat himself where hypotheticals were used
Like the saying of Rasūlallah ﷺ;
"If there was to have a Prophet after me, it would have been 'Umar bin Al-Khattab"
Just Repeatedly throwing in the word "hypothetical" does not absolve one of kufr.
But it would still be beneficial if someone knowledgeable can explain what the ahkaam of hypotheticals are in the shariah,
What types of hypotheticals are there,
was that statement of Qasim Nanotwi really even a hypothetical or was he affirming the possibility of the coming of another prophet
Is it correct to say that there are stages to hypotheticals.
A true hypothetical does not AFFIRM anything
But Qasim Nanotwi was affirming a kufri possibility
So in reality his statement was NOT a hypothetical but an affirmation.
Hypothetical
: involving or being based on a suggested idea or theory : being or involving a hypothesis : conjectural
Hypotheticals of themselves do not result in kufr (of course there are caveats to this).
In a nutshell, what nanotvi got wrong and fell into the black dungeoun of kufr is the following:
He tried being clever and saying that the meaning of Khatam is understood by commonfolk to mean final chronologically. However he and his cronies apparently knew that it doesn't carry this meaning only but it means a special rank as well (this is when they keep mentioning martabi).
Now, the word khatam in itself does contain various meanings. However, in the nass of Quran related to this matter the meaning is Qati' aldalalah meaning that he alaihi salat wa salaam is the final and last prophet.
Thus when nantovi says "if a nabi comes after his time it will not affect the khatamiyyat", he effectively is removing in absolute terms the applicability of the meaning of being last and final in time, thereby resulting in the following kufr:
Allowing the possibility of a Nabi who is lower in rank to the prophet peace be upon him to come after his time. (note: the deos do believe that no nabi has come after the prophet peace be upon him, however, the statement of nanotvi allows the possibility of such which is kufr. Its example is a person saying "i believe with absolute certainty that angels exist and this belief is core to Islam, but if someone believes they don't exits its not a big deal").
The muslim position is that the prophet Muhammad peace be upon him is the final and last prophet in absolute terms and it is impossible for a nabi to be born after the prophet peace be upon him. In our muslim position even holding the belief of possibility (not actualisation) is kufr.
Thus mawlana Shahid did a good job in asking "if a nabi comes today will it affect the khatamiyyat?". The results are only two:
- Yes it will = nanotvi's statement was wrong (but the wretch would rather save the scoundrel and not prove his statement wrong).
- No it will not = deos do not believe the prophet Muhammad peace be upon him is the final and last prophet absolutely.
In either case the wretch would be a loser. In the first he would lose the debate. In the second he would lose his aakhirah.
أُو۟لَـٰٓئِكَ ٱلَّذِينَ ٱشْتَرَوُا۟ ٱلْحَيَوٰةَ ٱلدُّنْيَا بِٱلْـَٔاخِرَةِ ۖ فَلَا يُخَفَّفُ عَنْهُمُ ٱلْعَذَابُ وَلَا هُمْ يُنصَرُونَ
Allah shower his mercy a hundred thousand fold upon alahazrat who saved us from such low and illogical beliefs.