Luke 21:25,26 has nothing to do with the parousia
The referenced verses have to do with the great tribulation also described by the other Gospel writers and more than Jerusalem is involved.( "...and what will be the sign of your parousia...")
Van, Rev 7:9,14 are not referring to tribulation in a general sense applying to Christians throughout the ages, but is the same tribulation predicted in the Olivette, having similarities with 70, as generally taught by wt. (And posting the word tribulation in Greek letters and defining it does not show that the related verses are not referring to the same tribulation mentioned in the Olivette. And neither does posting the commentary source. ) Rev 7:1 is a continuation of Rev 6:17 and starting with verse 12 of Rev chapter 6, is referring to an event, the same event also being told in Rev chapter 7, and not tribulation that you describe in a general sense that you also link with Act 14 and Rev 2. That's how I see it, Van.