With Hoffman's regression becoming a trend it looks like Senzatela may possibly take his place in the starting rotation.  Hoffman's recent drop in velocity is concerning.  

Earlier in the year when Hoffman was pitching well his fastball was humming in at 94-97 mph and he could get away with pitching up in the strike zone a bit, now at 92-94 mph on his fastball his pitches up in the zone are getting plastered. 

I wonder if Hoffman isn't hitting the rookie wall and experiencing tired-arm syndrome.  In any case, the Rox cannot afford to keep sending him out to start if his performance doesn't improve.