I think Sims himself would tell you that he has lacked consistency and focus throughout his time with Detroit, Philly and Indy. He admitted as much.
What I'm hoping is that what he said about sitting at home making him realize that he needs to work at his craft is also true. He said getting a family now and realizing that football could be over with has made him much more of a student of the game, and he is now working on the mental part. Because he has always been so physically gifted, he didn't feel like he really had to work on the mental part of the game as much. Now that he has matured and been at home sitting on his couch some, he sees how important football is and how much he needs to work on the mental aspect of his game.
I think that he played pretty darn well for us last season considering he was in probably the worst system for him in all of football, and he hadn't been through camp with Dallas and had very little prep time before he saw live game action. He wasn't all world in 2012, but considering the scheme we was in and that he came in partway through the season, I thought he played very well for us.
By all accounts he is playing exceptionally well this preseason. I'm sure a big part of that is because he is such a terrific athlete and in this scheme, that is very, very important. However, as big as a stickler as Garrett is about the details, I'm sure he knows if Sims isn't studying enough or blowing his assignments... But all we've heard out of Garrett about Sims is how well he's been playing.
I do like Durant a lot too though, and he is an exceptional athlete in his own right, so I'm fine with whichever player wins the job. The only reason I'm pulling for Sims is because he's got that mad dog mentality that I think our defense has been lacking for years and years. That attitude that Sims has is indeed catchy and will carry over to the whole unit. It will particularly if the unit plays well and has a lot of early success. They're going to be cocky and confident anyway, but with Sims out there they will have that same crazed dog attitude that he does.
Just my 2 cents.