It's only Game 6, that's all. If Ron Washington's Game 6 lineup outscores Tony La Russa's Game 6 lineup, there's an excellent chance for the Texas Rangers to win their first World's Championship in the 51-year history of the franchise.
This lineup's little different than what Washington would use against a right-handed starter; the only difference is that Gentry plays against right-handers and David Murphy plays against left-handers. But it's worth mentioning that Jaime Garcia is not particularly vulnerable against a lineup like this; probably because he throws a lot of cutters and change-ups, his platoon splits are virtually identical.
Which doesn't mean you can't get to him. It just means that if you do, it's not because you stacked your lineup with right-handed hitters.