Okay, I considered the possible scenarios and here's what I came up with:
I. DD wins HoH. She puts Jameka and Zack on the block.
A) ED or DD wins POV, choices stay the same.
.....1) ED votes off Jameka. She would be the toughest for either ED or DD to beat head-to-head.
.....2) ED votes off Zack if he thinks DD and Zack are getting too close - not likely.
B) Jameka wins POV, she takes herself off the block which means DD has to put ED up.
.....1) Jameka votes off ED, which I don't think DD would protest too strongly.
C) Zack wins POV.
.....1) He takes himself off the block because he would be insane not to at this point. DD has to put ED on the block.
..........a) Zack votes to evict ED, which I really don't think would bother DD that much as ED would be one vote for her on the jury and he might be able to swing some votes from the other HGs... not likely but possibly how DD's mind might work.
..........b) Zack votes to evict Jameka, pretty much insuring himself of a third place finish unless he's very lucky because neither ED or DD would pick him to take to the finals.
II. Jameka wins HoH. She puts DD and ED on the block.
A) ED wins POV.
.....1) He takes himself off the block and then votes to evict Zack.
.....2) He takes DD off the block and she votes to evict Zack.
B) DD wins POV.
.....1) She takes herself off the block and then votes to evict Zack.
.....2) She takes ED off the block and votes to evict Zack.
C) Jameka wins POV. The choices remain the same.
.....1) Zack votes to evict ED, because he likes DD best.
D) Zack wins POV.
.....1) The choices remain the same. Zack votes to evict ED.
III. Zack wins HoH. He puts ED and Jameka on the block.
A) ED wins POV.
.....1) The choices remain the same. DD votes to evict Jameka.
B) DD wins POV.
.....1) The choices remain the same. DD votes to evict Jameka.
C) Jameka wins POV.
.....1) She takes herself off the block. She votes to evict ED.
D) Zack wins POV. The choices remain the same.
.....1) DD votes to evict Jameka.
Under those possible scenarios, it looks like ED is most favored to go home, with Jameka a close second, Zack a distant third and DD pretty safe unless something really odd goes on...