I would keep on eye on how Bush is being used. If Bush is lining up at WR and Lamar Miller comes in as the RB it could prove to be the Dolphins best package on the field. I don't think that Daniel Thomas is very good, plus he fumbled last week and really hasn't been impressive ever in the NFL. Lamar Miller runs hard inside and has track speed and some juke moves to go with it so I think that if he gets some carries he could spring a big run or two and take that job provided that Reggie Bush plays more of a utility RB/WR role which is probably what he is best suited for as it is.
Lamar Miller is 5-10 218, so he's not like the 4.4 speed 200lbs guys that become the trendy sleepers with no real shot at carrying an NFL workload. The opportunity situation in Miami is cloudy, but I think he has a big talent edge on Thomas and Bush is a unique player who has coexisted with other productive RBs in the past. Why he isn't playing more already I do not know, but perhaps:
"Miller’s effort as a blocker is not good enough. He will deliver a punch, and he has skill at getting the correct angle to make a block. But he does not sustain the contact and work hard enough to maintain that position. Miller diagnoses blocks effectively, but he has to do better with his cut blocking. He drops his head too early. As a run blocker, he seems more worried about getting hit from behind or hurt in the act of blocking than helping his teammates make plays." -Matt Waldman (
http://fifthdown.blogs.nytimes.com/2012/04/09/lamar-miller-third-ranked-running-back-in-2012-draft/)
I have only seen highlight videos of Miller so I can't really comment on his complete game, but Waldman watches a ton of film and knows what he is talking about. It's comforting to know that Waldman feels he diagnoses blocks effectively, as apposed to not understanding like I think Beanie Wells is guilty of.
Waldman also states in that article:
"I can see the Portis comparisons because Miller has game-breaking speed, explosive lateral agility and enough downhill power and balance to generate big plays in multiple ways. The difference is that Miller makes running the football look easier than Portis did in college, and I think it might be part of the perception that his effort isn’t always there when in fact, he’s just more graceful than people realize."
I think the difference is that Portis ran lower to the ground, but Miller certainly has similar physical tools. Portis was slept on a bit coming out of college too. William Green and TJ Duckett were the percieved cream of that RB crop.