Issue three discuses a bit about the changes Zoom made and Barry makes a line about him knowing Barry would search out the Justice League. Thomas then points out The Butterfly Effect (as mentioned above). Everything essentially waves out from the death of Barry's mom. I suppose Johns in particular is once again reinforcing Barry Allen's "importance" to the DCU and making some kind of commentary about him begin the "heart and soul" of it as well. The fact that this whole event is a Flashcentric event would indicate that.
Oh it also took me a few minutes to figure out who the remains of Subject 2 were of...and I suppose we can figure out who Subject 3 was...oh Rao.
Oh it also took me a few minutes to figure out who the remains of Subject 2 were of...and I suppose we can figure out who Subject 3 was...oh Rao.