Had the Prophet (saw) been sent in the times of earlier prophets, they would have remained prophets to their peoples, while he would have been a prophet over all of them. His prophethood is therefore more general, more comprehensive, and greater - Fatawa al-Subki

Fatawa al-Subki cover - Taqi al-Din al-Subki
Isa (as) will descend upon the law of Muhammad (saw) - Taqi al-Din al-Subki part 1
Isa (as) will descend upon the law of Muhammad (saw) - Taqi al-Din al-Subki part 2