You are forgetting that just before the Second Coming of Christ there is the Marriage of th Lamb in Heaven (Rev 19). Therefore the Resurrection/Rapture cannot possibly be the same as the Second Coming. All the saints must be present in Heaven first, and only then will they descend with Christ to earth.
Well...this is supposing that Revelation is properly read in order from beginning to end, rather than a series of repeating visions. There is some debate on that today, with good points and strong arguments on both side.
However...I still don't find this argument compelling. Because at some point, people who are believers in Christ
will be upon the earth while there are those in heaven. Even during the Tribulation period, when you say this Marriage of the Lamb will happen, not "all" saints are in heaven, are they? Those taken in the Rapture are. Those who died before the Rapture are. But those who came to Jesus after that are still on earth and therefore miss the Supper. Does this mean they are lesser Christians? Not part of the Bride? They attend the Supper by proxy? A marriage supper is a celebration of the marriage itself. And to truly celebrate, the Bride must have her groom. Can we truly say then, that this Supper can happen while some of the Bride is absent? I don't see this making sense.
So...either this Marriage Supper can happen when some Christians are still on Earth, or it happens at Christ's single return as he gathers all to him, both dead and alive saints. Or, the Supper described in Revelation is symbolic of the spiritual reality of what actually is.
I know Dispensationalists hate it when we talk in terms of "spiritual" realities, as if we're dismissing the weight and importance of biblical truths, but I assure you we do not. Let me try and explain it like this...we have a physical reality...here on earth one we can see, hear and feel. But we all know that there is a spiritual reality out there that we cannot see, feel or hear. One where God has his throne room, where Christ is now seated, where angels worship constantly, and where our loved ones go after death, to wait the final consummation. When we talk of "spiritual realities", all we mean is the bible is describing things that take place there, rather than here. And I think we can all agree that what happens there is potentially even more important and real, than what happens here!!
So when I say that perhaps this Supper is talking of a spiritual reality, what I am suggesting (only suggesting, mind), is that Revelation is talking about how the Church, in Christ, IS the Bride. When Christ returns in his final, triumphant coming, defeating death, making all things new and vindicating his Bride and himself, then in a very real way, that is a consummating ceremony. Our following him into the New Heavens and New Earth to begin and eternity of love, fellowship and worship is the beginning of our new life together.
That is how I see it, anyway. Like I said...I could be wrong. But I still feel my point about Rev 19 and the separation of the "bride" is a factor that cannot be ignored. It doesn't seem to make sense (to me), to say "it has to be 2 separate comings, because all the Christians have to be in heaven at Rev 19"....when all the Christians aren't in heaven at Rev 19. At the END of Rev 19...maybe. But still...not for the Supper. Don't you think that's a bit odd?
