Good point Gary,
Look at how the "kurios" in v15 its translated as "Jehovah" but in verse 16 its just plain ole Lord.
15
For this is what we tell YOU by Jehovah?s word, that we the living who survive to the presence of the Lord shall in no way precede those who have fallen asleep [in death]; 16 because the Lord himself will descend from heaven with a commanding call, with an archangel?s voice and with God?s trumpet, and those who are dead in union with Christ will rise first.......NWT