Not that there was much reason for him to make a change. For one thing, this lineup hit three home runs and put 15 guys on base against Greinke and the Brewers bullpen in Game 2.
And for another thing, have you seen Gibson's bench? Here is Gibson's bench:
There's not a lot there to choose from. All of those players have their uses, but none of them are more useful than any of the guys who're starting. One might argue that drafting a starting lineup, then, is the easiest part of Gibson's job.
As for Collmenter, he's a guy who relies on command and deception, so Gibson and the rest of the D-Backs will be crossing their fingers that he doesn't get exposed by a potent order in a hitter-friendly ballpark. He sure does throw weird. If you haven't seen Josh Collmenter throw, you're in for a trip.