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'Ambitious and aggressive': Inside the Chiefs' defensive overhaul

KANSAS CITY, Mo. -- Defensive coordinator Steve Spagnuolo looks at what he's trying to accomplish with the Kansas City Chiefs and at times sees eventual success. At other moments, he seems overwhelmed by the process.

"I've been through this first-year thing a number of times," said Spagnuolo, a veteran defensive coach. "Sometimes it's gone really good, and sometimes it hasn't gone so good."

In 2019, the Chiefs are facing the unknown with an overhauled defense filled with new stars and new coaches. Nobody, not even Spagnuolo, is certain how it will work out.

But the Chiefs had to try something.