Ending the season on IR for the third time in five years. That's rough, I feel for the guy. We'll miss his blocking/special teams contributions no doubt.
On a side note, it seemed like his snap count started to decline last month so I wonder if this has maybe been something that's been nagging him for a while?
This could also be the end of Seattle's use of 13 personnel as we know it (unless they promote or pickup a TE).