What is the fine-grained topic of the following text: The conversations were so involved around the time of the 2007 trade deadline that Briggs, a free agent the following offseason, figured he’d be wearing a 49ers uniform in 2008 and had a conversation about the possibility at the Pro Bowl with Willis, who was coming off his eye-opening rookie season. Only return the topic.
Lance Briggs' potential transfer to the 49ers in 2008