Every prophet comes with a sign. So why worry about it? Why should we worry about the finality of the prophet of the Quran? This is not an article of faith in the Quran and smacks of sectarian disputes. Its about disputing with Ahmadis. Leave the Quran out of sectarian sidputes. If a prophet comes than we can see what signs he have what arguments he presents. How did people know Moses was a prophet? How did they know Muhammad was a prophet? Many didn’t because they did not believe in the signs they came from. You don;t use hadiths to win some sectarian argument, because the other sects won’t follow your hadiths and probably have their own hadiths. Every sect have different hadiths even though they follow the same Quran. Amazing stuff!!!