It's been 15 hours and the killer still hasn't been ID'd....there had been no names of anyone deceased officially for at least 10-12 hours after the shootings.
I'm not talking about the killer, who could've shot them and left without being seen. You seem to be employing a double standard when it comes to obtaining information. You yourself found out that your friend's sister was a victim (r.i.p.), but an official list of the deceased hasn't been released. Your argument is riddled with so many loopholes it's incredible. There are any number of conceivable ways in which the r.a. and the g/f could be identified after they were shot. Once this happens, at the very least, people who were close to them find out.
In order for your theory to be plausible, the kid would have to shoot two people in the middle of a dorm while being in a loud fight and leave the building without being seen. The following events would also have to happen:
The victims can't be ID'd.
No one can know who the g/f cheated on him with.
No one heard the argument because they would find out that this a jilted lover seeking revenge.
No one can hear the gun shots because they would come to scene. If the g/f lived in that dorm, which she probably did because he b/f looked for there, her floor/room mates could ID her. Basically if anybody stumbles across the scene, they ID the g/f. Plus if she didn't live in the dorm, she has reason to be there so unless the RA was the only person that knew her, she would get IDed.
etc.
Your theory = //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif