What about the apostles?
The way I see it is we have 12 ‘normal’ key players left.
Jack, Kate, Sawyer, Sun, Hurley, Ben, Sayid, Miles, Juliette, Jin, Lapedis (?), and Richard.
Even though they are not all in the same place, Jack, Kate, Sawyer, Hurley, Miles, Sayid, Juliette, and Jin are possible still in the 70s, and every one else is with Richard, I believe they are all working towards the common good, or at least what they believe it to be.
It makes sense, we have 12 key players left alive, and there were, well, 12 apostles.
I have read recently that smokey is Locke.