Ben was a candidate
I guess I’m only stating the obvious but here it goes.
The name Linus is written in the cave but crossed out according to the Lostpedia page on “Candidates”.
Miles stated that Jacob was hoping till the bitter end that he was wrong about Ben.
So I assume that Ben was once a candidate but that Jacob crossed him out at some point for some reason.
I guess this means that Ben (and others) can still prove to be a candidate again.