Maybe you didn't watch the games or check the lines....
KC has been nothing close to a running team so far this year. Week 1 they threw 33 times, ran 16 LJ averaged 4.3ypc. Week 2 32 Pass, 23 Rush 3.43 ypc. Week 3 they split evenly, but LJ only managed 1.75 ypc.
They played three very solid run D's in the first three weeks, @ HOU (6th vs. Run), @ CHI (12th vs. Run), then at home against MIN (3rd vs. Run) last week. Next week they get San Diego on the road, then at home against Jacksonville. Both teams with stout run defense and absolutely no secondary.
THEN they get the Bengals (20th vs. Run), Raiders (22nd vs. Run), BYE, Packers (10th), Broncos (29th), Colts (14th), and Raiders again (22nd).
Can't tell me LJ won't be the main attraction from week 6 on.
Bowe will turn into Eddie Kennison from last year, the best receiver on a team that doesn't throw the ball.
As far as Harrington being better then Mike Vick, Joey's sporting a 68.8% completion percentage and a QB rating of 90.6 after 3 games with his new mates. Mike Vick's BEST EVER completion percentage is 56.4 (career avg 53.8) and his BEST EVER qb rating is 81.6 (career avg. 75.7).
Roddy White is by FAR the better choice.
Hope this was helpful.