Westbrook isn't really a fluke. He's just the same type of pitcher as Garland. He's a groundballer who needs help from his defense. He's a good #4 starter, just like Garland. Their career numbers are even eerily similar...
Jake Westbrook (career stats): 4.39 ERA | 1.37 WHIP | .273 BAA | 4.85 K/9
Jon Garland (career stats): 4.42 ERA | 1.38 WHIP | .265 BAA | 4.92 K/9
If Westbrook is a fluke, then so is Garland. But Cliff Lee has only had one good season which was last year. Who knows if he's the real deal or not.