KANSAS CITY, Mo. — The Kansas City Chiefs — for the eighth straight season — are AFC West champions. And as a result, their starters are likely to get a week’s rest before the most important games ahead. KC’s offense had a bounce-back effort in Sunday’s 25-17 home victory over the Cincinnati Bengals, as the Chiefs flashed big plays in the passing game and overall efficiency while averaging 7 yards per play. The result, coupled with Buffalo’s win over New England earlier in the day, means KC’s playoff spot is secure. The Chiefs will be the AFC’s No. 3 seed, playing a to-be-determined opponent i…