From players getting COVID-19 vaccinations to relaxed coronavirus protocols to lineup issues, particularly at quarterback, the NFL faces a multitude of questions as training camps open.

(George Walker IV/The Tennessean via AP, Pool, File)Shopping on the NFL free agent market can be so very tempting. Just ask the Tennessee Titans. Busting on free agents doesn't stop any NFL team from trying again. CORY LITTLETONThe Raiders thought they were getting a difference-maker when they signed linebacker Cory Littleton to a three-year, $35.25 million deal. STEPHEN WEATHERLYWeatherly was a major bust for the Carolina Panthers after the defensive end signed a two-year, $12 million deal last offseason.

The Titans traded Casey to Denver this offseason in a salary dump, clearing $11 million in cap space by sending the five-time Pro Bowl defensive lineman to Denver for a seventh-round draft choice. Even with Casey on his side last year, Henry was stifled in a 16-0 loss at Denver, gaining just 28 yards on 15 carries. That was easily the low point in a season in which Henry ran for an NFL-best 1,540 yards. “Having a player of his caliber and his leadership not be out there with us is definitely going to be a blow to the team," Casey said. “He’s a game wrecker,” Henry said.