He's back, but I would bet money that he re-injures the hamstring again sometime in the next several weeks. I don't know a whole lot about the subject, but from what I have read and watch regarding hamstring injuries, once you start getting them, it becomes easier and easier to get them again. When healed, there is scar tissue on the hamstring which isn't as pliable as the original tissue, and the stress on that tissue increases the chance of re-injury. Miles has had several of these injuries in the past several years, so I'm somewhat expecting a repeat of last year when this nagged him all season.