"Ye heard before in the word of the truth of the gospel; which is come unto you, as it is in all the world . . . the hope of the gospel, which ye have heard, and which was preached to every creature which is under heaven." - Colossians 1:5-6, 23
The “gospel” simply means “good news.” All scripture must be kept in context. For example the “gospel of the kingdom” (Matt 4:23) deals with the good news of a kingdom that God was offering the Jews but never came about because the Messiah was rejected and crucified. This was not the good news of the death, burial and resurrection of Christ (1 Cor 15:1-4) which has not been heard by every nation yet, else why do we still send out missionaries?. John Piper explains it this way, “Paul is emphasizing the fact that the gospel embraced by this little group of people in this little town of Colossae is the very gospel that is proclaimed in all creation under heaven. It does not say, “has been proclaimed” — it “is proclaimed in all creation.” Everywhere it goes, it is being proclaimed, and it is bearing fruit. Don’t think the global mission of preaching is complete. It isn’t. There is a great work to be done precisely because the gospel we love and preach is unbounded in its personal, cultural, and eternal relevance for every people on the planet. In other words having reached Rome, where Paul wrote Colossians, the gospel of 1 Cor 15:1-3 had reached the center of the known world. MacArthur
"Your faith is spoken of throughout the whole world." - Romans 1:8
Once again, as the center of the Roman Empire and the inhabited world, whatever happened in Rome became known universally.
The gospel had been "made manifest " and "made known to all nations for the obedience of faith." - Romans 16:26
Rom 16:25 "Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,"
Rom 16:26 But now is made manifest, and by the scriptures of the prophets, according to the commandment of the everlasting God, made known to all nations for the obedience of faith:
The gospel or good news , once a mystery, is now made manifest and is no longer limited to the nation of Israel but to the Gentile nations also.
"For from you sounded out the word of the Lord not only in Macedonia and Achaia, but also in every place your faith to God-ward is spread abroad." - 1 Thessalonians 1:8
Every place they went their faith was manifested.
None of these passages you raise explain how the great tribulation never seen before or since the beginning of time, the moon and sun going black, all the tribes of the earth mourning, and seeing the Son of man coming in the clouds of heaven with power and great glory, and the gathering together his elect from the four winds, from one end of heaven to the other took place in 70 A.D. It is obvious these are future events. While I can’t explain every detail of the Second Coming of Christ, I do know some aspects of what you believe are not 100% correct either.