The Dodgers are known for the luxury of having too many starting pitchers. While their quantity is very good, they also have quality depth. After all, Kenta Maeda is now a late inning reliever for the Dodgers, and Brandon McCarthy and Hyun-Jin Ryu did not even crack the playoff roster in any series. The Dodgers starting rotation has been in place for most of the season, the one big move they made was acquiring Yu Darvish in a buzzer beater type deadline deal.
The Astros have a very similar blue print as the Dodgers in regards to their starting rotation.