Dockery coulda been traded?

per ESPN http://sports.espn.go.com/nfl/news/story?id=3941156

The Bills didn't place Dockery on the waiver wire, and there had been interest by the Detroit Lions in acquiring him in a trade.Dockery flew to Detroit Friday for a visit and a physical. The Bills didn't get the paperwork in on a trade, so he was officially released Friday.

Did the Bills fuck up or did Detroit pull out? I think either way Brandon doesn't look good here