KC has a very underrated defense and is very good.

We always like to be on teams that aren't going to beat themselves, especially in the NFL, and the Chiefs are certainly one of those teams. Since they lost to the Vikings last October (2015) Kansas City has won something like 18 of 21 games. The Chiefs are tough at home and Arrowhead is one of the toughest stadiums to play in, and Kansas City clearly knows the importance of this game if they want to win the AFC West.

KC plays smart and doesn't turn the ball over. On the flip-side Oakland is the most penalized team in the league, by far, which is also something that's going to catch up with them.
Lastly I also trust Any Reid more than Jack Del Rio and I expect the Chiefs to win by 6 or more tonight at home.