Can you post the relevant Scripture? Because I think that those are the tribulation saints....
It goes with the understanding of John's chronology. He starts chapter 4 with Christ on earth, then His resurrection, then His ascension back into heaven, then opening the seals to start the church age, then TIME passes as martyrs are killed, then finally the church age ends and the Day of the Lord begins, then the 70th week begins, then the midpoint comes (7th trumpet) and then the end (7th vial), then Jesus returns to armageddon, then the 1000 year reign, then the GWT and then eternity. No flashbacks. No backpeddling. He did use parenthesis to just ahead for the two witnesses and for the Beast and False prophet. He did stop his timeline of the seals, trumpets and vials for intermissions to redo the setting to fit the next act - so to speak.
I said all that to preface this: in chapter 7 the church age has just ended and the day of the Lord has just started, but NO EVENTS yet. John has to "rearrange the set" before he can proceed with the 7th seal that officially starts the 70th week and the first event of God's wrath: trumpet 1.
TWO events MUST take place before the first event of wrath is accomplished: the church must be safely seen in heaven. CHECK! The great crowd. The 144,000 MUST be sealed. Check. Accomplished.
Then the 7th seal is opened to reveal the trumpets.
In comparison, here are the tribulation martyrs:
Rev. 15:2 And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God.
(The trib' martyrs will begin when the days of GT begin, and they are caused by the Beast and False Prophet that are not even mentioned until chapter 13. )