Monday, we looked at the San Francisco 49ers' breakouts players in 2013. Today, let's look, in alphabetical order, at some of the candidates to take the next step in 2014:Adam Kilgore: Kilgore is a candidate to start if the 49ers don't re-sign 35-year-old free-agent center Jonathan Goodwin. Kilgore has been in the program for a few years and has played in some packages. He may soon get his chance to be a full-timer.Vance McDonald: The 2013 second-round pick improved as the season went on, especially as a blocker.