Didn't see this thread in the first few pages and the search function is offline right now. Anyway, these are my comeback/breakout players of 2014. Feel free to add an explanation for your choices as well.
Vance McDonald: I honestly don't know why McDonald had such a bad rookie year. Yes, the passing offense was terrible but I thought for sure he'd get more attention because teams would be more focused on Davis and AB. I'm invested to see what he'll do in Training Camp, but I expect him to have more of an impact this season. Maybe around 500+ yards and 4+ TDs.
Chris Culliver: Culliver was my favorite corner coming into the 2013 season -- before his knee injury. Now it's Brock, but I still like his physicality and his toughness. I'm pulling for him to start this season, provided we don't pull off a major trade in May and draft Justin Gilbert (My current draft crush). I'd say 4+ INTs with 10+ pass breakups.