something aint right with Doug martin

I've been thinking this since last year and I see it again in camp and in pre season . Doug Martin has no vision or explosion anymore. Dude just runs up the middle and gets blown up. In my opinion he's done.  Call me crazy but I think he will not start and the staff saw something they didn't like and thats the reason they got sims.  Rainey is a better back than Martin is and has true homerun potential