[Scorpion]

why is a guy with four concussions in a season playing?

http://abcnews.go.com/blogs/he...ion-prone-49er/
“He’s had a lot of concussions,” Giants wide receiver Devin Thomas told the Newark Star Ledger. “We were just like, ‘We gotta put a hit on that guy.’” Thomas went on to praise safety Tyler Sash for landing the dizzying hit. “Sash did a great job hitting [Williams] early, and he looked kind of dazed when he got up. I feel like that made a difference, and he coughed it up.”
Jacquian Williams, the Giants linebacker who forced the second fumble, said Williams’ previous concussions prompted the hard hit.
“The thing is, we knew he had four concussions, so that was our biggest thing, was to take him outta the game,” he told reporters after the game.

[Mac4Lyfe]

why is a guy with four concussions in a season playing?

.

Because 4 concussions are not a lot in this league...