If the postseason were to begin today, the Astros would likely have a rotation of Justin Verlander, Framber Valdez, and Lance McCullers Jr. in the top three, with either Jose Urquidy or Cristian Javier filling out the fourth slot. For much as I like Luis García, he is the odd man out in my book, although his exclusion isn't a certainty at this point.
Honestly, though, not much of a surprise if this alignment comes to pass, especially among the top three. There is nuance regarding matchups at home or on the road to account for, but not much of a discernible difference.