The passage states, "Blessed and holy is the [one] having A PART in the resurrection the first [adjective]"... and we see that Greek word "first [adjective]" used elsewhere translated as "chief" where Paul says of himself that he is the "chief [adjective; same Greek word] of sinners" but this doesn't mean first-in-time to have ever occurred, right? Things can either be "first-in-time" or "first-in-quality"...
This is a prime example of the pretribber trying to work around the passage somehow to make it fit with pre-trib. The 'evidence' for pre-trib time after time is some kind of way to make it work with problem passages. No one ever presents a verse that shows that the 'parousia' is multiple events. No one ever quotes a verse that lays out a time sequence with a rapture before the tribulation. Instead, posts try to explain away passages about what happens at the second coming saying that isn't talking about the same coming as the rapture.
Can you find any examples of 'protws' being used to mean 'chief' where 'first' doesn't kind of make sense in translation? In context, it makes sense to translate it as 'chief' in some cases, but it is a number word that has a bit broader meaning. It doesn't lose it's numeric meaning. We don't get to just choose a translation of it,and strip it of its numerical meaning, whenever doing so fit with our eschatology.
Jesus called that commandment about loving God the first and greatest commandment. We might say that has the sense of 'chief' , but that is clear from context if we know about the Bible and commandments. Herod had a chief for 'first' men of Galilee'. Jesus taught that whoever would be 'first' shall be the servant of all.
Revelation 20:
5 But the rest of the dead did not live again until the thousand years were finished. This
is the first resurrection. 6 Blessed and holy
is he who has part in the first resurrection. Over such the second death has no power, but they shall be priests of God and of Christ, and shall reign with Him a thousand years.
Notice first resurrection, second death. There is a flow of argument here. First and second are both numeric terms. Why would first mean 'chief?' That's the problem with pre-trib. How in the world would a first century reader read any of these documents and come away with a pre-trib understanding?
... and another evidence of this fact is that 1Cor15:22b-23 [re: resurrection] speaks of the future occurrences in the following way: "but each [a word meaning, 'of more than two'] IN HIS OWN ORDER / RANK," meaning,
Look at the passage.
I Corinthians 15
22 For as in Adam all die, even so in Christ shall all be made alive.
23 But every man in his own order: Christ the firstfruits; afterward they that are Christ's at his coming.
Christ is in the first 'band' or 'order'. The second band is 'they that are his at his coming.' One interpretation is that the third band, the unrighteous, are raised later. The book of Revelation shows a later resurrection.
But this passage just shows two bands-- Christ and they that are his. The second band is resurrected at Christ's coming. This is evidence against the pre-trib rapture theory.