It's tricky to choose between Chris, Ricky and Lynda. According to the dance-prediction thread, both Chris and Ricky have rumba, which should grant them a hefty sympathy vote but also root them to the foot of the table. Older people tend to do really badly early on, but there might be a pro-older lady vote floating around after all the Arlene scandal nonsense.
Joe's not going to leave, and judging from the training footage Jade can best anybody in the dance-off so those two should be safe. I can't see a hunk departing this early, so Rav is almost certainly safe as well.
Abi and Martina are middling. If they end up in the dance-off with any of the first three they should trounce them (even if they do worse dances they'll be saved on "potential"). Any of the latter three and they might struggle. They might have to rely on the judges scoreboard but they should be fine, because I can't see all three of Lynda, Chris or Ricky escaping it.
I'd guess Martina vs Ricky, with Ricky going home but it's a toughie.