The only one that seems like it has a chance to bite us is Taco. We were down two bodies in the secondary and the staff is fearful about what happened in the bowl game, so getting guys experience is a good thing there. Anybody who can find a role is going to help the team this year and anybody who doesn't probably isn't going to be a guy you want to keep around for year 5 anyway (if he's behind the guys in his own class he's unlikely to hold off Peppers, et. al). We knew Butt and the running backs would probably have a role and they were in the game fairly early (and with Johnson hurt they'd have been in even earlier). And Gedeon looks like a guy who would be immediately in the mix if one of the three MLB were to go down.
Charlton is still raw and just has so many guys in front of him (7 other DE played) and the SAM spot (especially when Ryan comes back) is producing pass rush as well so I'm not sure where he fits in at any point during an actually competitive game. Maybe the staff think he's a surefire off-to-the-NFL guy (and he has the frame to do it) but I don't know that he'll make any kind of impact this year and as such I'd like to have kept that extra year in the back pocket. York may be the other potential regret, but again, if he can't be of any help this year (just one big catch could make a difference) then his 5th year probably won't be missed. That's another spot where injury has pushed everybody closer to the field with Darboh out for the season.