Having seen the Buffalo defense four times in preseason, including a scrimmage in which the Bills dominated the Browns, it’s difficult to believe the unit won’t be vastly improved over a year ago. The additions of tackle Sam Adams, linebackers Jeff Posey and Takeo Spikes and strong safety Lawyer Milloy were huge individually and even more significant collectively. The Bills could be a top 10 defense, and Spikes will finally merit the attention he deserves, along with a Pro Bowl berth.