OK, I get it.
Are you saying that somewhere between his departure and his return that a tribulation occurs and that, therefore, it is necessarily post-trib?
When is the "great tribulation?"
Since Christ told us that tribulation and persecution would always follow the church and since Rev 7 describes those coming out of the Great Tribulation as being 'countless' and as being from believers from ~every~ tribe, tounge, language and people (apparently including Jews), I must conclude that the Great Tribulation is from the time of Christ's resurrection until his return.
Jean