The biggest difference is not in the front 4, still one-gap primarily, but what the back 4 are doing. We saw more cover-3 and cover-1 (which is primarily man) under Raheem's version. I really like the t-2 but I also like the ability to switch from to the other in a moment's notice.
The Berry speculation is BPA, which will last until the combine when Berry comes in closer to 5'9 185 lbs than he is to 6' 203. That would pretty much rule him out at SS and wouldn't make him the sure-thing that many believe him to be at FS. And you don't project a guy to another position (CB) at #3 overall. Hopefully if Suh and McCoy are gone, we trade down for Brian Price and pick up an additional early round pick or two in the process.