KC doesn't have to get a QB that's the best in the NFL. They can't pass on Barkley just because he's not as good as Andrew Luck. They need good QB play to compete in the NFL. You don't necessarily need a first ballot HOF QB to be in position to win a lot of games late in the year.
The KC fan base is absolutely going to riot if KC's management comes up with excuses to avoid taking a QB in this draft.