Why would we have Webb playing dime CB? I can't fathom how you would consider us not playing Humphery in that position. More than likely, we'll have Canady as a 5th CB, and he was doing a fine job playing ST until he was injured. Humphery will more than likely be given every opportunity to compete for Carr's spot, but likely will be in nickle/dime packages. In any case, if you haven't been watching Raven's games the last few years, we have had so many problems fielding a competitive secondary late in the season, it will be a relief to have capable guys who can come in and play at a high level. Webb may see some time at CB, but my prediction is that would be very limited and only if the injury bug hits us during a game. He's going to be the main back up safety,(and wouldn't be surprised if he does some return work also) not a full time CB.
In my ideal world, we play a lot more dime packages (something we literally played none of last season) and Webb is part of that package, as a coverage guy either at CB or Safety (in Dime I'm not sure it really matters). Lack of depth/quality player at ILB to me means we should put more secondary players out there, especially on passing downs. Finding a way to get Weddle/Jefferson/Webb on the field at the same time seems like a good idea to me.
You didn't pay Carr to sit on the bench. The dime might play 1 down out of three and as of yet Humphrey isn't proven. As you mentioned we have Canady and Sheldon Price from last year that when they played they were good and showed much potential. We have oodles of safety's. Was Humphrey that great a pick in that we ignored other needs - specifically o-line. With a trade back you get that o-lineman , you get an extra pick and the dbs are still strong and you have improved the o-line. IMO this was a miss. Now that the pick has been made I want Humphrey to be all-pro but that means Carr or Smith sit and they are getting paid big bucks.