The rebellion was the Jewish rebellion against the Romans. Notice Titus must be revealed prior to the Day of the Lord. The problem you are having (I think) is "the coming of the Lord Jesus Christ and our (their) gathering to Him." So, did this happen after Passover of 70 AD?
First off the word, "coming" would be better translated as "presence." The word Paul uses is parousia 3952 which is the same word the disciples used in Mat 24 when they inquired as to when His presence would return. The glorified Christ in Heaven is a bright light that cannot be looked upon by mortals, just as was the case with His Father. However, the presence of God appearing to man was usually in the form of a dark cloud under His feet. At night it was usually a pillar of fire.
Since the Garden, God never appeared directly and visibly again. The same now must be assumed for Christ appearing from heaven on the clouds of heaven with power and great glory. Pay close attention to this. It is an appearance in the sky above. The same description found in Mt 24 is found in Mt 26 when He prophesies to the religious leaders.[SUP] 64 [/SUP]Jesus said to him, “It is as you said. Nevertheless, I say to you, hereafter you will see the Son of Man sitting at the right hand of the Power, and coming on the clouds of heaven.” Jesus is telling those about to put Him to death that they will see Him again, in heaven with Power and coming for vengeance in the skies above.
Secondly, the gathering to Him, what does that mean? Here again, another incomplete translation. The actual Greek text says, "and of us gathering together to Him." The word here is episunagoge, 1997 which means a complete collection, specifically a Christian meeting (for worship) - assembling (gathering) together. The only place in the NT where this exact word is used is here in 2 Thes 2. However, the root word gather, episunago, 1996 is also used by Christ in Mt 24:31 and Mk 13:27. These are the only two places in the NT that use this word!! Other examples of "gather" such as the 'gathering of tares' or 'gather out of his kingdom' use sullego 4816, to collect - gather (together up). So we are talking about a Christian gathering.
What is it when two or more get together? For where two or three are gathered together in My name, I am there in the midst of them.”
So, the gathering of the elect is NOT a collection of the elect taken forcefully so don't confuse this with the rapture (harpazo of 1 Thes 4). Instead it is a Christian assembly of Saints with the angels which occurs during or in close proximity to the parousia (presence return) of Christ as powerful God. We have a collection of saints on Mount Zion who heard a divine voice and were told to leave Jerusalem. The voice of an angel said, "Let us remove hence." This is also in the historic record.
The parousia of Christ during the Jewish Roman War was recorded by Josephus as related to him by many eye witnesses. The gathering of the Jerusalem church as told in Rev 14 and 2 Thes 2, is also recorded by Josephus and many of the early church fathers.
I already went into great detail explaining how Titus fits.