I watched the game and didn't notice anything special by Johnson. And the one time we really got to see him, he gets injured making a tackle. He'll never make it on the team with performances like that. He really needs to show something on the field and be able to stay healthy. Too much competition this year for him to stick with another injury-riddled year.
I was about to post the obvious. He didn't make any outstanding plays (he looks like he's still playing tentative to me), but I was really impressed with him. He was right where he was supposed to be, showed good range and solid tackling, and seemed to know his responsibilities and be a good athlete.
Wilcox, by comparison, flashed on a couple of plays, but looked to me like he was all over the place out there. He might be tearing it up in practice, but I thought he showed good potential but looked like the kind of player who can get you burned badly once you get a few weeks' tape on him.