Steele didn't have surgery until December. Remember how we all marveled at Peterson coming back in 8 months and played lights out? A full year was, and is still to a large degree, the standard recovery time for an ACL injury. 8 months for Steele is still August, even if he was released by the doctors at 8 months he's still got to get in game shape and regain confidence in the knee.
He won't be ready to play by the season opener, in all likelihood. Personally I'm thinking he won't be back on the field until October at best. Hopefully I'm wrong, but I just don't see it happening before mid-season....