"I assume "writing Heller" is fancy speak for ruling in his favor? So they'll rule individual right?"
No, it simply means that he's the judge who is writing the majority opinion of the court. There's always a judge who writes a majority opinion. Other judges who were in the majority can also write opinions. Then there's usually a judge who writes a minority opinion, basically a response as to why those who voted against the majority did so. That has no true weight of law, as I understand it.