You have to be a member of the Hall of Fame first before you can become an Immortal. It says so on the NRL's website (
source:
https://www.nrl.com/hall-of-fame/induction-process/becoming-an-immortal/)-
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As such Cameron Smith won't be immortal no. 14 as he is not a member of the Hall of Fame. Nor is Jonathan Thurston.
That would also mean the immortal is likely to come from someone on this list who isn't already one -
Read about each NRL Hall of Fame players profile, match statistics, and career information on the official NRL website.
www.nrl.com
So I could see guys like Ron Coote, John Sattler, Bob McCarthy, John O'Neill, Peter Sterling, Brett Kenny, Gene Miles, Glen Lazarus, Steve Mortimer, Mark Graham, Stacey Jones, Steve Walters, Brad Clyde amongst the contenders.