When Alex Smith (33 interceptions over the past five seasons) was at quarterback, the Chiefs knew he wouldn't turn the ball over. They can't assume the same with second-year pro Patrick Mahomes taking the reins in 2018. Mahomes' future is bright, but I don't think he'll be off-the-charts great immediately -- he's only started one game in the NFL, and you have to expect hiccups when working in a younger, less-experienced player like that. And, of course, former offensive coordinator Matt Nagy -- now coaching the Bears -- will be missed. Kansas City did add some offensive firepower by signing receiver Sammy Watkins, but the real issue here is the defense, which gave up points and yards by the bushel last season. Marcus Peters, Derrick Johnson and Tamba Hali are gone, while Justin Houston hasn't reached double digits in sacks since 2014. Signing linebacker Anthony Hitchens was a smart move, and cornerback Kendall Fuller -- who came over in the trade that sent Smith to Washington -- is a good player, but I don't see anyone on the roster who can rush the passer like Houston in his heyday. The key is safety Eric Berry. Will he be fully recovered from the Achilles tear that wiped out his 2017 season?