Only think that I can think of is that it helps to cover most of the large population centers and almost he entire east coast. Also not sure of eastern mountain ranges. Looks like it would cover them. Again, just a guess.

Those are probably points on the power grid the Espehni are building. You've already seen the tower in Boston in Season One and in the end of last nights episode.

I think they did not use Hathaway or Manchester because they were not that big a part of Tom's personal past. Dai has been there from the beginning of Season One, so it made more sense for his memory to pop up in Tom's hallucinations. Plus Dai's death was dealt with in much more detail than Manchester and Hathaway,…

You obviously don't pay attention to the fans who follow Falling Skies. It was a major shock when Dai was killed of last season, epsecially since Dai and Anthony were an important part of the cast behind the main stars. While not given every big line, supporting characters can easily blend into the background but…