So does Mitchell.
I have not been impressed with him at all.
There was one play on a screen of sorts that the Ravens threw that he did about everything wrong a CB could do on that play.
YR
Mitchell apparently looked good early in camp when there were no officials around because he could grab, tug and pull on receivers to keep them from abusing his lack of speed. It appears that with the officials calling contact tightly that he's just a penalty waiting to happen or a speed bump.
Marinelli would have to almost exclusively use cover 2 with Mitchell in the game for him to have a chance. Webb, on the other hand, has the speed and fluidity to match receivers without having to grab them. I'd rather have that in a DB than one who might be a more willing tackler, but can't cover.
Right now, I'd rate the DBs fighting for the last one or two spots Webb, Patmon, Mitchell and Green.