No, that's it EXACTLY. Eko's decision was when he was a boy, but Charlie say, it could have been mere hours. He may have decided to ask his brother to do the band again, or ask his brother for help getting clean, and at the last second decided not to.
Kate may have blown up Wayne, but then decided not to run. or not run as long, not to Austraila. I believe that is what the flashbacks are showing, decisions, now we have to decide which one is the one they go back to, if they do at all.
Sawyer, yes, is hard to pin. We'll see more of him, but it seems like he has to just let go of his anger. not become a conman, maybe an underwear model. (I'm not gay, that's what Josh Holloway did for a while)
I believe Locke will never leave. Why would he, his life seemed so scattered before, and this is what he always wanted to do. He'll prob marry Rouseau.