It is also during Christ's parousia that he comes forth and gathers his people. Likewise it is also during Christ's parousia that he comes forth and brings the holy ones to heaven.
Matt: 24:29 "Immediately after the tribulation....
Matt: 24:30 "And then the sign of the Son of Man will appear in heaven... (celestial display of some sort according to Watchtower's most recent interpretation)
"And they will see the Son of man coming ...
"And he will send forth his angels with a great trumpet sound and they will gather his chosen ones together from the four winds from one extremeity of the heavens to their other extremity"
The gathering of the chosen ones is associated with Christs coming.
The separation of the word coming and presense is word play. The only reason this becomes an issue is because the Watchtower first of all needed to explain the no-show of 1914. Secondly it is necessary for making sense of a century long period of Christ hanging around in preparation for armageddon.
Forget about Third-Witness. He's another You Know. And You Know what happened to him. Third-Witness is just another JW on his way out. He isn't acting on behalf of the governing body.