Vikings RB Adrian Peterson (knee) is considering a game-time decision for Sunday's season opener against the Jaguars.  But HC Leslie Frazier admits that AP won't see much action even if he is active.  "We recognize if he's able to get in this first ball game, it'll be with limited exposure," Frazier said.  "We'll talk about it as the week goes on and see how he's doing and if it's even a valuable option to let him play."  We're just reading tea leaves, but it sounds like Peterson might be held out altogether.  Even if he plays, he won't be a recommended fantasy option.  Toby Gerhart, meanwhile, should see 15+ touches and make for a fine RB2 play.