The last convo I saw between memphis and Dan on BBAD was Memphis saying, "Dude, it really doesn't matter who wins the final comp - we're in, so let's just play it for real." That was right after Memphis and Dan did their Renegade handshake, and Memphis told dan that if Dan "F'ed" him he would cut his hand off and keep it in a jar next to his bed. That's when Dan gave him the cross. I think they will definitely take each other.
With regards to Jerry's vote - Ha! Once he walks through that door and Keesha has a go at
de-Memphisizing him, there won't be any doubt that Jerry will vote for Dan. Even if he bases it purely on game-play. He will be even more hurt than Keesha was when he finds out that Memphis was only using him. I think it would be very interesting if the jury voted 7-0 for one or the other, but I doubt if there's anything that will make Ollie ever vote for Dan, unless April threatens to hold out sex from him.
I don't know the history - but has anyone ever won Big Brother with unanimous votes?