I don't think the 144,000 are here when the two prophets that are killed in the street and then are risen are here, and then some time after that, Jesus comes.
it's been the Lord's way when dealing with the world, He gives them ample info before the result of their own judgment befalls them. if my memory serves Noah spent the better part of a hundred years building the ark. and that would in and of itself be a testimony of things to come.
so man and Israel in particular are not left without the Truth in the world until the last minute so to speak.
the scenario I have been told though I have heard many, the Christian promise of "rapture" happens (which may not have to be the resurrection) with 144,000 believers 12,000 from each tribe of Jewish people are retained to prophecy then the two prophets that have the same power as Moses and Elijah had. I suspect they will be Moses and Elijah not only for that reason but also the "transfiguration" that James John and Peter saw with Jesus that included Moses and Elijah talking to the Lord.
but that's one of many. thing is about prophecy, no one knows how its going to go down until after it happens. why? you may ask. because its not for you to know when and how, but it is for you to know after it happens who said it would happen, therefore who's will is being done. Israel was promised through Abraham that the Lord their God would return them to the promiced land out of Egypt. they didn't know how and they really didn't know exactly when, but when the Lord showed up they knew what was going on, though yes many blamed Moses rather then acknowledge the Almighty.