The Eagles' best and most productive offensive player this season was a ghost again last week, missing from the practice field and the locker room, his future for the next month and beyond the kind of topic that pro football players don't often dare discuss.
Ryan Mathews suffered a concussion three weeks ago, in a game against the Dolphins, and hasn't played since. There is no telling when he will play; he is, according to Chip Kelly, still going through the NFL's concussion protocol. How serious this injury is and what it portends for this season and the remainder of Mathews' career remain open questions, and they are the gravest questions for him.