May'be the candidates aren't only candidates for replacing Jacobs position but also the position that Mib holds. I was thinking this because of how he is now "locked" in lockes body and how parts of lockes personality are starting to come thro in him, the whole "dont tell me what i cant do" is basically his catch phrase and there is a possible relevance in the way locke brought this up in his conversation with helen. I also found the crossing out of lockes name very significant, so maybe the point here is that locke has now replaced Mib and in a way he kinda chose him as a replacement very unwittingly. This would also suggest that jack will probabaly be the one who takes jacobs position as the relationship between jack and locke throughout the show in a way is very similar to that of jacob and mib. Plus it always perplexed me why the guy who plays jack said that he knows the end and thinks 2/3rds the way thro his and lockes character will finally come to a head. strange thing to say considering hes dead. also to finish the rocks on scale must have some connection to adam and eve and the "inside joke." Maybe one of those bodies is jacobs or mibs b4 they became who they are.