The encouraging aspect of Miller from last year is that he mostly shined when his number was called. Bush is a dancer who can break off a 60 yard run or will get stuffed for negative yards. Miller seems to get the ball and just hits the opening without much hesitation. He also averaged just about 5 yards per carry so the signs are there that he has good potential. If Bush leaves via free agency there is no doubt in my mind that Miller, not Thomas, will be the #1 back in 2013. He is also only 21 years old.