Not to sound shallow but ever since seeing the coming attractions for B-Bac MT. Jake Gylanhall has been a bit tainted/typecast to me. In Zodiak I didn't see him as a serial killer, and in Jar Head I didn't see him as a Marine.
As for the 1992 MTVA incident, I don't feel it was significant to Kurt or Axl. Doubtful it will be in the possible movie.
First of all, Jake G. wasn't the serial killer in Zodiac!! He was a dude who drew cartoons and became obsessed with finding the true identity of the killer. As for everything else, most of these suggestions suck.