Opening Day draft grade?

[RMSkins]

If I had to give grades to our rookies just based on preseason results mine would be:
Devin Thomas F: He looks flat out scared when he is on the field. Tenative on Kick returns, let's the ball come to his body instead of catching it with his hands, and from what we're hearing he can't grasp the playbook. Hopefully Devin can turn things around, but it doesn't look like we'll be seeing to much productivity from him in a few years. I think he has a 50% chance to be a flat out bust.

Malcolm Kelly F/Inc: Have to give him an F because he can't even get on the field. Chronic health problems have to concern the FO. If Kelly can ever get healthy I think he will end up being more productive than Thomas.

Fred Davis B-: I would like to see improve his blocking, but he looks to be a keeper. I expect Davis to be the most productive out of the "big three" this season.

Chad Rinehart C: Looks great one game looks awful the next. I do like his versatility on the line though given that he can play Tackle and Guard. Hopefully he can become more consistent.

Justin Tryon F: Has a big mouth, but he can't back up any of his talk. I have no idea how he made the roster. Almost every time I saw an opposing receiver catch the ball I would see Tryon running behind him.

Durant Brooks C-: Was outperformed by Frost in the preseason which isn't a very good sign. I will give Brooks the benefit of the doubt, but he hasn't shown me anything yet.

Kareem Moore B-: Needs to work on his angles a bit, but I fully expect him to become a major contributer with us. He showed me that he can come up and play the run, he's a solid tackler, and he looks decent in coverage. So far he's probably the pick I am most excited about. I am a bit concerned with his knee though.

Rob Jackson C+: A prototypical speed rusher. I like his hustle, but he seems to disappear a lot. He also needs to work on his run game.

Chris Horton B-: I think Chris, like Kareem, will become a major contributer for us in the near future. He needs to work on his tackling a bit, and he wasn't really tested in coverage to much, but he is a good blitzer and he can play special teams.

Colt Brennan B: Definitely the most productive player out of all the draft picks. So far Colt looks like he can contribute at some level in the NFL. I think Colt is going to end up being a good #2 in his career, who knows, maybe he can become a starter, but he still has a lot of work to do before he can achieve that.

Remember, before anyone decides to blast me, that these grades are based PURELY off of preseason performances, and things that the coaches have said about the players.