Our Frank Schwab counts down his NFL power rankings, grades each team's offseason and previews the 2024 season. The Panthers hire Dave Canales. The Patriots draft Drake Maye. Bo Nix might start for the Broncos. The Commanders have a solid offseason. The Giants struggle to move on from Daniel Jones. The Titans hire Brian Callahan. The Raiders aim to create the next QB. The Cardinals have hope for Marvin Harrison Jr.