Nope Jen and Zach did agree to vote out Dick. I don't think they would do that to Jess. Really depends on how Dick will convince people.
Jen shouldn't give Dustin her vote for crap. Look what he did to Kail. "Im your fourth vote". Ummm no, just kidding.
Zach doesn't like Dustin so I dunno if his thing will change. But then again, he likes Jess.