Courtney and Jason from Season 1 had chemistry from the start but I see big problems when it comes to where they live. Jason is like my cousins, a New Yorker through and through, and now that he is officially part of the NY fire department he's not moving. I believe Courtney didn't emphasize enough how much she wants to eventually live back in North Carolina (which looked rural). So even though they had chemistry there's lots of other factors that can keep or break up a couple. Sean and Davina could end up like that. Who knows, just because a couple makes it through a year doesn't mean it's forever.
And I think the producers should be faulted for the terrible pairing of Jaclyn and Ryan. Ryan is looking for someone to help raise his niece which is a huge responsibility to put on anyone, let alone a "meet at the altar" bride. Knowing his story and seeing his wimpiness makes me think he was too passive and just wanted to find a wife without all the work. As much as I don't like Jaclyn I can't blame her for being turned off by him and the very serious, sad situation he is in (with his sister's death, niece, etc).