different positions, but look at the players themselves. both 6'0 200 pounds. both have good muscle tone, but still very lean. both are great runners with excellent speed who have an innate ability to break opponent's ankles with ease, and turn on a dime anywhere on the field. now the only reason i bring up the comparison is because vick isn't the most durable guy on the field, and he doesn't get hit nearly as much as bush will be getting hit running the ball. i like bush, but this is definitely a concern.