Given how he was rolling, you had to let him start. Although the ump missed on strike on Soto and called it a ball, which might have cost Houston the World Series. If Greinke retired Soto, maybe he finishes the inning, and then they change up their matchups the rest of the way. Otherwise, it's that age-old question of whether it's better to keep your starter for the 3rd time through the lineup at 80+ pitches, or go with a bullpen arm.But there's a good argument Greinke should never have come out to pitch that inning.
I don't understand why they didn't go to Cole for the 9th. Sure, you're down, but you absolutely need to keep it close there. Giving up those extra 2 runs really just killed any hope you had. Being down by only 2 going to the bottom of the 9th, with Washington not exactly running a trusted closer out there, and it's still a tense game. Down 4 and it's a lost cause.