Thing is though, Lord Jesus in Matthew 24:29-31 and Mark 13:24-27 preached the same thing that Apostle Paul did in 1 Thessalonians 4:13-17.
Notice the highlighted verses in red. They are a direct parallel to what Paul taught in 1 Thessalonians 4:13-17 about the rapture:
Matt 24:29-31
29 Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
31 And He shall send His angels with a great sound of a trumpet, and they shall gather together His elect from the four winds, from one end of heaven to the other.
KJV
Mark 13:24-27
24 But in those days, after that tribulation, the sun shall be darkened, and the moon shall not give her light,
25 And the stars of heaven shall fall, and the powers that are in heaven shall be shaken.
26 And then shall they see the Son of man coming in the clouds with great power and glory.
27 And then shall He send His angels, and shall gather together His elect from the four winds, from the uttermost part of the earth to the uttermost part of heaven.
KJV
The Matthew 24:31 version is about the 'asleep' saints Jesus brings with Him when He descends to earth:
1 Thess 4:13-14
13 But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope.
14 For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with Him.
KJV
The Mark 13:27 version is about those still alive that are "caught up" on that day of Christ's coming:
1 Thess 4:15-17
15 For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep.
16 For the Lord Himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
17 Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
KJV
The Scripture evidence then is actually that Apostle Paul had to have gotten the events of 1 Thessalonians 4 from Lord Jesus in Matthew 24 and Mark 13.