In 2018, the Astros had a rotation of Justin Verlander, Gerrit Cole, Dallas Keuchel, Charlie Morton, McCullers Jr.
— Danny Vietti (@DannyVietti) October 7, 2021
They have since lost and replaced 4 of those 5 starters. 3 of the replacements came from within their farm system.
They had the 2nd-best ERA in the AL this year. pic.twitter.com/1ys8QWm33s