NFL preseason power rankings: Raiders, Lions live up to silver standards

Summer is definitely here and so soon will be the NFL, just after the current new season of Game of Thrones ends. When we last left all the teams, from the AFC Essos to the NFC Westeros, the Patriots ruled all the eight conferences after their magical comeback victory in Super Bowl LI. With camps opening and preseason football right around the corner, here's where the power struggle now stands.