The vast majority of time, when you here guys are being tried at a different position in camp, it usually means they aren't going to cut it at their main position so you give them a shot at another. I really don't think guys like Ham at FB or Exum at CB are going to make the team but maybe they can catch on somewhere else. Too early to tell of course but to me a switch does not usually mean a positive...kinda like Clemmings being tried at Guard.