We have already established that the "we" in 1 Thessalonians is not always Paul, Silas and Timothy. In 1 Thes 2:2 it cannot include Timothy as only Paul and Silas were mistreated in Philippi (despite your bizarre unwarranted claim that Timothy was mistreated as well). Nor does the "we" include Timothy in 1 Thes 3:1 as the next verse makes clear; and the timeline in Acts indicates it doesn't include Silas either.
Here's the qualification:
Acts 1:22 "one of these must become a witness with us of His resurrection."
And here's why it was needed:
Acts 1:1-2 "to the apostles whom He had chosen....He also presented Himself alive after His suffering, by many convincing proofs, appearing to them over a period of forty days and speaking of the things concerning the kingdom of God."
Acts 4:33 "And with great power the apostles were giving testimony to the resurrection of the Lord Jesus"
To be an apostle you must have seen the risen Christ in person (Acts 1:22)
and you had to be personally appointed by him. Not all those 500 were appointed apostles.
Paul, like the other apostles, was personally appointed by Christ.....
Acts 26:16-18 "I have appeared to you to appoint you as a servant and as a witness of what you have seen and will see of me. I will rescue you from your own people and from the Gentiles. I am sending you to them to open their eyes and turn them from darkness to light, and from the power of Satan to God, so that they may receive forgiveness of sins and a place among those who are sanctified by faith in me."
Gal 1:1 "Paul, an apostle—sent not from men nor by a man, but by Jesus Christ and God the Father, who raised him from the dead—"
And Paul said he was the last person the see the risen Lord...
1 Cor 15:8 "and last of all, as to one untimely born, He appeared to me also. For I am the least of the apostles"
So there can be no apostles today.