cal was dylan andre was eric right.
It seems obvious to me that this movie is pretty much an attempt to recreate the columbine event.
Andre kriegman seems to me to be representing eric harris; he is angry like harris feared by people like harris was, seen as weird and hateful like harris. Definately seemed to be the brains and dominant force behind the assault like Harris was
Cal seemed to represent dylan more the quiet type who went to the school prom who was suicidal and in some degreee led along by andre.
However in the final scenes depicting the massacre within the library the footage that doesent exist for the real columbine cal seems to represent Eric Harris far more. He is the one screaming at students and taunting them more, until the suicide it seems that the two shooters switch roles.