Whitner's Role
It appears that instead of cramming Whitner in the box solely to help out in the run game this season, the Bills are actually going to expand his in-the-box role by sending him on blitzes and covering slot receivers. From the sounds of it, Whitner is looking forward to this opportunity:
"That option is there and it does excite me. That's what I made a living on in college, playing the slot receivers, playing in nickel, blitzing, jumping on bubble screens and things like that so I'm really excited about the opportunity."
Whitner may turn into this team's "jack-of-all-trades" defensive back, playing multiple positions and carrying several responsibilities; there's a reason for this - the team needs him to make plays. By giving him short zone coverage responsibilities and sending him after the quarterback on occasion, it's pretty apparent that the coaches are looking for a way to get more impact plays out of their second-year defensive cornerstone. If Whitner can get comfortable in this role, he could be very good.
Multiple Nickel Packages?
With Whitner getting more time in coverage on slot receivers, it's very likely that the team will have two nickel packages that they use - one for the pass, one for the run. This makes sense in a lot of ways - having Whitner as the nickel man gives the team a little more beef in the box on run fronts, and having Kiwaukee Thomas there with Whitner deep (instead of Jim Leonhard, who replaces Whitner when he moves up) gives them better pass coverage. Thomas had this to say on the subject:
"Sometimes offensive schemes just come at the nickel... all a receiver has to do is shield you off and they're going to run at the nickel a lot... One week it might be him in there, one week it might be me in there based on the game plan."
That's all but a confirmation to me. Having the two nickel packages provides better matchup possibilities for the defensive backs and takes a little pressure off of the young guys to "do it all", so to speak.