The Vikings were never getting anything, there wasn't any precedent for that. If that were so, the 49ers and Bears would be entitled to picks as well since Mooney and Woerner were part of the tampering. The NFL isn't going to start doling out to picks to teams that are "victims" of tampering, but they really aren't victims. They just don't want teams tampering with players/coaches under contract with other teams or significantly before FA starts.