'Ges' often means just the land of Israel in the gospels. In mt 24 we already have the parallel to the preaching throughout Israel (Mt 10), which was maybe never finished--the language is very similar. Either way, there is the matter of speaking to Israel first so as to save the land. Mt 5's salt of the earth is easily understood as the preserving the land of Israel from destruction: his followers were not to be part of the rebellious/messianic crowd, and were even told to help soldiers. Paul seems to understand the whole end happening so fast, that he was compelled to get to all the nations he could, and even says it was preached to all nations twice; Col 1 and 1 Tim 2.
The worst time is relative to Israel's history. Given the fact that 'much is required of those whom much is given' it really was the worst. As for saving the elect, he had elect in Israel he wanted to save, and so told them to leave upon the imminent surrounding of the city.
I think Jesus puts it quite simply too, just not as future as you, until v29. Before that it is about Judea, direct, present danger, practical. After 29, with some similarities drawn, it is global and after the DofJ, with the allowance that the end was to be decided by the Father.