I dont think the names on the wall are jacob's candidates.
This is because jacob recruited llana and co. and they were talking about candidates and she was asking 'what lies in the shadow of the statue?' to see who was a candidate which richard answered so is he the candidate? they were saying that frank hadnt answered the question so couldnt be a candidate.
also none of the candidates on the wall would be able to answer this question so are they talking about candidates for the same thing? was the question just to see who they could show the body of locke to? its been confusing me about llana and how much she knows. why did they come? to save jacob? to replace jacob? why wouldn't jacob just tell them who the candidates are rather than tell them of candidates but make them work it out somehow. hmmm i keep changing my mind about her.