^^ Because Bryan Q. Miller has been keeping the series tradition of loosely adapting the comic book story lines. This version of the Crisis on Infinite Earths is going to be for the same reason as the actual one was. There will be no reboot here. This though will be the first major event of the Smallville continuity, and as I've predicted from the start of the season, the event that brings together the Justice League proper.
Ninja'd by AJK.
fair enough, thanks to both of you.