There are many ahadith about return of Jesus, from both Sunni and Shiite sources. In Shiite sources, it's from what I see, at the level of Tawatur. There are so many authentic, reliable, along with weaker chains, but all together, so many, that's hard to put doubt on it being narrated unless you are going to doubt hadiths all together.
The narrators we rely on narrate it, and we would have to throw most hadiths, if we are going to deny this event. This is not rational, as the return of Isa is both in Quran and Gospels, and even hinted in the Torah (I can get into this about Idris being risen if you want).
To be honest, brother, I'm going to be creating a program to help humans study Islam better. It will have easier way to see what is meant by Tawatur. Like in the program, it will show how many hadiths you will have to throw out from literature of ours, to deny these ahadith. Right now, I don't have the exact knowledge, it's just from memory. But one day, I will make this application and it will be that and more.