There's always a reason to be concerned about the various mending bones and muscles around the NFL. That doesn't go away deep in the offseason, when there are no games to prepare for and no practices to miss.
Offseason injury concerns are different and often drift to more troubling thoughts that come from dark places. In April, there are few insignificant injury questions that can be shrugged off with little thought.
Questions like these ones: Will Houston Texans defensive end J.J. Watt bounce back to the same level? Will Minnesota Vikings quarterback Teddy Bridgewater ever play again?