DuBose vs Heath: DuBose put himself on the map last game by showing great hands on offense. Sounds like his run blocking was also strong. If he continues with any semblance of how he played in Cleveland, I guess he gets the 6th WR spot over Heath.
Calson vs Joseph: I've been leaning towards Carlson for a while, but his tendency to make kicks just inside the upright continues to concern me. Joseph hasn't been perfect, but it seems like more of his kicks (especially the "easy ones") go right down the middle.
Joe Wilson vs Ben Sims: Wilson had a statement game with his receiving. Not sure how his blocking compares, but he certainly put himself on the radar. Sims seems to be mainly a blocking TE with low ceiling.
Clifford vs Pratt: Pretty neck and neck. Clifford stumbled early, but seemed to recover nicely. Pratt throws a nice easy ball. Hard to tell who has the advantage at the moment.
Dillon vs all other RBs: As was said several times... the dude just dances too much. You are trying to get one yard and are a 250 lb back - drive through someone. The OL didn't give him much room, but other backup RBs seemed to find space. Wilson looked like his usual pre-season brilliance.
Backup OL: Someone (especially at T) needs to step up. No one looked bullet-proof out there.
Backup DL: Really the opposite. They looked very strong and deep.
Safeties: Certainly, better depth than last year. Hard to know how well they will fit in when you are playing vanilla D against early offenses, but everyone looks pretty good now.