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This photo makes a great deal of this point for me. Despite being the secondary being viewed as the "weak link" on the team, rookie safety Eric Berry and third year cornerback Brandon Flowers are Already widely respected as studs in this league—and they're only getting started. The two are a near perfect blend of thunder and lightning in the Chiefs' secondary.
Flowers had struggled a little bit in the last couple of games going into Sunday, but he hasn't given up many TDs at all this season. Flowers is becoming the kind of corner that gets his own island, and he's only going to get better as he gains experience.
Berry is a run stopping, hard hitting safety who can play both sides of the field. He's actually getting much better in coverage as well, getting an interception or pass deflection in each of his last four games. He's also been matched up against some of the NFL's top elite tight ends already and held his ground. Dallas Clark, Antonio Gates, Owen Daniels, Mercedez Lewis, and Vernon Davis have produced only one TD and combined for around 270 yards.
The rest of the secondary isn't strong, but they're solid. Cornerback Brandon Carr is looking more aware in play, which is his only real weakness to speak of. The nickle back, Javier Arenas, may be lacking in size, but he can stick with slot receivers and makes good breaks on passes that come his way.