I noticed a link between the beginning and the ending.
In the very first minute there were two boys on bicycles admiring Jax and his biker gang - also the photo which Jax digged out for Opie, showed two boys (him & op) on bicycles.
I'm not exactly sure what the authors wanted to say, but it definitely felt "whole" like a new beginning.
We love you Opie! :'(
Music: Greg Holden - The Lost Boy