I always figured one could write a book on Brian and why he claims to hate Pittsburgh so much, but never leaves. You know there are all sorts of psychological reasons, most of which Brian himself is probably very conscious. The fact remains that he DIDN'T leave, so Justin has to come back.
And yes. It's impossible for me to understand how people think Brian isn't an inspiration to Justin. That just seems like a big huge "duh" when you consider it for even a second.