they're 27th in the league in passing, so they're not winning because of Smith. but Smith will definitely end up costing them a few games where they'll need some offense. KC's defense won't always be able to hold and score for the offense, and they're vulnerable against the run as it is.
KC hasn't beaten anyone yet and are playing a last place schedule, people need to remember that.
1) When you're 12th in the league in running the ball with the league's #5 RB in yards, why do you need to pass?
2) They aren't winning because of Smith? So, they added him, went from 2-14 to 9-0 and it's because of Andy Reid?
If you really think Smith has nothing to do with this turnaround, you don't watch much football.