The Buffalo Bills might not be able to get their most pressing need sorted out before the season begins, and that's a huge worry.

As of this past week, running back James Cook is the only player who has failed to check in for Buffalo Bills' OTAs in Orchard Park, but as the seemingly-disgruntled holdout works out on his own, Cook's teammates are taking advantage of priceless opportunities at One Bills Drive.

The Buffalo Bills began OTAs Tuesday, and according to reports, every player was in attendance except one — James Cook. The star running back awaits a contract extension, and while OTAs are voluntary, he may be taking his negotiating tactics to the next level.