Good question. I know he can't workout with the team or at Valley Ranch but not sure if he can be in contact with management as well as player support of the Cowboys Calvin Hill. Hill is not listed as management or a coach so not really sure about this
I would expect the Cowboys would have him working with somebody to get him as close to playing as he could be once he becomes available. Someone that can teach the 3-4 and go over the defensives schemes.