This document discusses 4 NFL teams that could be dark horses in the 2021 season: 1. The Arizona Cardinals improved to 8-8 last season and added players like AJ Green and JJ Watt to support Kyler Murray and Deandre Hopkins with a projected record of 11-6. 2. The Cleveland Browns made the playoffs last season and could challenge for AFC dominance if Baker Mayfield cuts down on mistakes, projected at 12-5. 3. The Los Angeles Chargers have a star in rookie Justin Herbert and could take the AFC West if Patrick Mahomes gets injured, projected at 11-6. 4. The San Francisco 49ers were hurt by injuries last year but have players returning like