I think the Browns have a shot but they need almost everything to go right. Although the national media is playing it up as of the biggest playoff upsets ever I don't even think it's top 20 should it happen.
07 and 10 and 11 Patriots losing to the NY teams, 01 Rams losing to the Pats, 96 Broncos losing to the Jags, 87 49ers losing to the Vikings, NO losing to the sub .500 Seahawks in the Beastquake game, the Colts losing to the Steelers and Chargers two different times, Pats upset the Chargers, 79 Rams beating the Cowboys.........
All that said I expect the Chiefs to win. Teams like the Browns never seem to play well two weeks in a row and they played out of their minds against the Steelers and there will be a letdown of some sort.