Panthers first-round draft pick Christian McCaffrey and 49ers first-round pick Solomon Thomas would love to be working with their new teams, but the NFL won’t let them. NFL rules don’t allow rookies to begin participating in offseason work until their schools’ semesters come to an end. For Stanford players like McCaffrey and Thomas, that’s a disadvantage because Stanford stays in session until June. So they’re stuck. McCaffrey said today on the Dan Patrick Show that he has been talking to the Panthers’ coaches on Skype to try to keep up as best he can. That’s better than nothing, but it’s obviously not the same as actually being at the team facility.